50 important number system questions
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For Bank, SSC, Railway & Insurance Exams
50 IMPORTANTNUMBERSYSTEMQUESTIONS
Important Number System Questions Free static GK e-book
50 Important Number System Questions
1) The digits of a two-digit number are in the ratio of 2 : 3 and the numberobtained by interchanging the digits is bigger than the original number by27.What is the original number?
1. 632. 483. 964. 69
Correct Answer: “4”
2) Three consecutive numbers such that twice the first, 3 times the second and 4times the third together make 182. The numbers in question are
1. 18, 22 and 232. 18, 19 and 203. 19, 20 and 214. 20, 21 and 22
Correct Answer: “”3
3) A two-digit number is such that the sum of the digits is 11. When the numberwith the same digits is reversed is subtracted from this number, the differenceis 9.What is the number?
1. 232. 243. 654. 14
Correct Answer: “3”
4) One-fifth of a number is equal to 5/8th of another number. If 35 is added to thefirst number, it becomes four times of the second number. Find the secondnumber.
1. 392. 703. 404. 25
Correct Answer: “3”
Important Number System Questions Free static GK e-book
5) What least number would be subtracted from 427398 so that the remaining number is divisible by 15? 1. 3 2. 10 3. 16 4. 11 Correct Answer: “1”
6) A number consists of two digits. If the digits interchange places and the new number is added to the original number, then the resulting number will be divisible by: 1. 3 2. 5 3. 9 4. 11 Correct Answer: “D”
7) Find a positive number which when increased by 17 is equal to 60 times the reciprocal of the number. 1. 3 2. 10 3. 17 4. 20 Correct Answer: “3”
8) A number consists of 3 digits whose sum is 10. The middle digit is equal to the sum of the other two and the number will be increased by 99 if its digits are reversed. The number is: 1. 145 2. 253 3. 370 4. 352 Correct Answer: “B”
Important Number System Questions Free static GK e-book
9) If 2(1/2) is added to a number and the sum multiplied by 4(1/2)and 3 is added to the product and then divide the sum by 1(1/5), the quotient becomes 25 .What is the number ? 1. 5(1/2) 2. 4(1/2) 3. 2(1/2) 4. 3(1/2) Correct Answer: “4”
10) The product of the 2 consecutive odd number is 6723.What is the greater number? 1. 80 2. 81 3. 82 4. 83 Correct Answer: “4”
11) The sum of three consecutive multiple of 4 is 72. What is the largest number ? 1. 26 2. 20 3. 28 4. 14 Correct Answer: “3”
12) In a bag there are coins of 25 paise and 10 paise in the ratio of 5:16. If the bag contains Rs.16 then the number of 10 paise coin is 1. 86 2. 87 3. 88 4. 90 Correct Answer: “4”
Important Number System Questions Free static GK e-book
13) (a-b) = 1, (b-c) = 2 and (c-a) = 3 then the value of (a3+b3+c3-3abc)/(a+b+c) is 1. 5 2. 6 3. 7 4. 8 Correct Answer: “3”
14) A hundred-digit number is formed by writing first 54 natural numbers one after the other as 123456…………….5354. Find the remainder when this number is divided by 8. 1. 4 2. 7 3. 2 4. 0 Correct Answer: “3”
15) If 20! is divided by 6, which of the following will be the remainder? 1. 0 2. 1 3. 2 4. 4 Correct Answer: “1”
16) The ratio between a two-digit number and the sum of the digits of that number is 4 : 1. If the digits in the unit’s place is 3 more than the digit in the ten’s place, find the number. 1. 36 2. 63 3. 48 4. 84 Correct Answer: “1”
17) The product of 2 numbers is the cube of its HCF. If the LCM is 1225, what is the smaller number? 1. 245 2. 175 3. 343 4. 210 Correct Answer: “2”
Important Number System Questions Free static GK e-book
18) If three numbers are added in pairs, the sums equal to 11,16 and 23. Find the three numbers 1. 8,6,16 2. 9,2,14 3. 9,5,14 4. 7,2,8 Correct Answer: “2”
19) Which of the following number is divisible by 11? 1. 29435417 2. 29435477 3. 57463822 4. 57648317 Correct Answer: “1”
20) When a number is subtracted from the number 8,12 and 20, the remainders are in continued proportion, Find the number? 1. 3 2. 4 3. 2 4. 6 Correct Answer: “2”
21) If a = -2 and b = -5 then find the value of a3 + b3 – a2 + b2 + 2a – 3b 1. -98 2. -100 3. 101 4. -101 Correct Answer: “4”
22) The average of 7 consecutive number is n, if the next 2 number also included then the new average will be increased by? 1. 0 2. 1 3. 2 4. 3 Correct Answer: “2”
Important Number System Questions Free static GK e-book
23) The last 3 digits of the multiplication 12345 × 54321 would be 1. 865 2. 745 3. 845 4. 945 Correct Answer: “2”
24) A number successively divided by 3, 4 and 7 leaves 2, 1 and 4 respectively as remainders. What will be the remainder if 84, divides the same number? 1. 80 2. 76 3. 41 4. 53 Correct Answer: “4”
25) If the sum and the product of 2 numbers are 25 and 144 respectively then the difference of the number should be 1.11 2.9 3.7 4.15 Correct Answer: “3”
26) A number when divided by 361 gives a remainder 47. If the Same number is divided by 19, the remainder is 1.18 2.11 3.9 4.13 Correct Answer: “3”
27) The sum of the two-digit number is 11. The number obtained by reversing the digit is 27 less than the original number. Then the original number is 1.74 2.47 3.65 4.83 Correct Answer: “1”
Important Number System Questions Free static GK e-book
28) A number when divided by the sum of 555 and 445 gives two times their difference as quotient and 30 as the remainder. The number is _________. 1. 1220 2. 1250 3. 220030 4. 22030 Correct Answer: “3”
29) Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is: 1. 75 2. 85 3. 65 4. 45 Correct Answer: “2”
30) N is the largest 3-digit number, which when divided by 3, 4 and 6 leaves the remainder 1, 2 and 4 respectively. What is the remainder when N is divided by 7? 1. 3 2. 2 3. 1 4. 0 Correct Answer: “4”
31) How many five-digit numbers are there such that two left most digits are even and remaining are odd and digit 4 should not be repeated? 1. 2375 2. 2800 3. 2950 4. 3850 Correct Answer: “1”
32) Two bells toll at an interval of 42 sec and 5 sec. After how many seconds, will both the bells ring together? 1. 250 2. 210 3. 630 4. None of these Correct Answer: “2”
Important Number System Questions Free static GK e-book
33) A banana costs Rs.1.25 and Orange costs Rs2.75. What will be the total cost of 10 bananas and 2 dozens Orange? 1. Rs.52.50 2.Rs.61.75 3.Rs.73.25 4.Rs.78.50 Correct Answer: “4”
34) There are some Crows and Some Tigers in a forest. If the total number of animals head in forest are 840 and total no of animal legs are 1760.What is the number of Crows in the forest? 1. 800 2. 740 3. 620 4. 590 Correct Answer: “1”
35) If the divisor is five times the quotient and six times the remainder, if the remainder is 5 then the dividend is 1. 225 2. 300 3. 185 4. 412 Correct Answer: “3”
36) How may odd divisors does the number 1,000,000 have? 1. 5 2. 6 3. 7 4. 8 Correct Answer: “3”
37) In a two-digit, if it is known that its unit's digit exceeds its ten's digit by 2 and that the product of the given number and the sum of its digits is equal to 144, then the number is: 1. 24 2. 26 3. 48 4. 42 Correct Answer: “1”
Important Number System Questions Free static GK e-book
38) Of 128 boxes of apples, each box contains at least 120 and at most 144 apples. The least number of boxes containing the same number of apples are 1. 5 2. 103 3. 6 4. Data Sufficient Correct Answer: “3”
39) N is the smallest number which when added to the 2000 makes the resulting number divisible by 12, 16, 18 and 21, Then the N is 1. 11 2. 7 3. 9 4. 16 Correct Answer: “4”
40) If x and y are the two digits of the number 653xy such that this number is divisible by 80, then x + y = ___? 1. 2 or 6 2. 4 or 8 3. 4 4. 8 Correct Answer: “1”
41) If x and y are positive integers such that (3x + 7y) is a multiple of 11, then which of the following will be divisible by 11? 1. 4x+6y 2. X+y+4 3. 4x-9y 4. None of these Correct Answer: “3”
42) Dushyant attends 40 questions and get 96 marks. If 3 marks are given for each correct answer and 1 mark is deducted for each wrong answer, find the number of questions she attended correct? 1. 15 2. 34 3. 32 4. 36 Correct Answer: “2”
Important Number System Questions Free static GK e-book
43) If the number 10*47* is divisible by both 5 and 11, then the missing digits are respectively 1. 1 and 5 2. 6 and 0 3. 5 and 0 4. 2 and 5 Correct Answer: “1”
44) Find the least number which must be subtracted from 103876 to make the obtained number divisible by 16. 1. 5 2. 4 3. 9 4. 7 Correct Answer: “2”
45) A certain even number K is given, which is not divisible by 3. What will be the remainder if this number will be divided by 6? 1. 2 2. 4 3. Either 1st or 2nd option 4. Any natural no. < 6 Correct Answer: “3”
46) If the number 517*324 is completely divisible by 3, then the smallest whole number in the place of * will be: 1. 0 2. 1 3. 2 4. 5 Correct Answer: “3”
47) When 1 is added to the numerator of a fraction it becomes 1/4 and 1 is subtracted from the denominator of that fraction it becomes 1/5. Find the fraction. 1. 4/19 2. 3/16 3. 5/17 4. 2/15 Correct Answer: “2”
Important Number System Questions Free static GK e-book
48) Sum of eight consecutive odd numbers is 656. Average of four consecutive even numbers is 87. What is the sum of the largest even number and largest odd number? 1. 171 2. 191 3. 101 4. 179 Correct Answer: “4”
49) In a three-digit number the digit in the unit’s place is twice the digit in the ten’s place and 1.5 times the digit in the hundred’s place. If the sum of all the three digits of the number is 13, what is the number? 1. 356 2. 456 3. 436 4. 626 Correct Answer: “3”
50) Two numbers such that the sum of twice the first number and thrice the second number is 100 and the sum of thrice the first number and twice the second number is 120. Which is larger number? 1. 64 2. 72 3. 65 4. 32 Correct Answer: “4”
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