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Number System problems with solutions for IBPS Exam

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Number System problems with solutions for IBPS Exam and SSC Exam

9 If 1 is added to the denominator of a fraction it becomes ½. If 1 is added to the numerator it becomes 1. The product of numerator and denominator of the fraction is.

1. 6
2. 10
3. 12
4. 14                                                           ssc cgl prelim exam, 24/02/2002

Solution let the fraction be x/y

If 1 is added to the denominator  the fraction becomes ½

x/y + 1= 1/2

2x = y + 1                                                          (1)

If 1 is added to the numerator the fraction becomes 1

x + 1/= 1

y + 1 = y                                                            (2)

From (1) and (2), we get

2x = x +1 +1

x = 2

Put this value in (2)

y = 3

The fraction is 2/3

The product of numerator and denominator 2×3 = 6

Number System problems with solutions for SSC Exam

10 The sum of digits of a two digit number is 12. The difference of the original number and the number obtained by interchanging the digits is 18. Find the number

1. 84                       2. 66                      3. 75                        4. 93

Solution let the unit’s place  digit be x

And ten’s place digit be y

Then the number is 10 y + x

And the number obtained by interchanging the digits = 10 x + y

The sum of digits is 12

x + y = 12                                                           (1)

The difference of the original number and the number obtained by interchanging the digits is 18

10y + x – 10x – y = 18

9y – 9x = 18

y – x = 2                                                            (2)

Adding (1) and (2), we get

2y = 14

y = 7

x = 5

The number is 75

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Practice Sets

Q1. The cost of 8 dozen of eggs is Rs. 256. Which calculation is needed to find the cost of 9 eggs ?

1. (9×256) × (8 ÷ 12)
2. (12×256) ÷ (8 × 9)
3. (8×256) ÷ (9×12)
4. (9×256) × (8×12)
5. (9×256) ÷ (8×12)

Q2. By how much is 6/11th of 506 lesser than 3/5th of 895 ?

178                b. 219               c. 143                d. 261                  e. None of these

Q3. The sum of two numbers is 45 and their product is 500. Their HCF is

5                 b. 9                  c. 10                       d. 15

Q4. Find the maximum number of girls, among whom 2923 bags and 3239 eyeliners can be distributed in such a way that each girl gets the same number of bags and eyeliners.

1. 80               b. 79                c. 78                   d. 81

Number System Question asked in Bank Exam

Q5. The denominators of two fractions are 5 and 7 respectively. The sum of these fractions is 41/35. On interchanging the numerators , their sum becomes 43/35. The fractions are

1. 2/5 and 4/7         b. 3/5 and 4/7         c. 4/5 and 2/7        d. 3/5 and 5/7     e. None of these

Q6. A number when divided by 902 leaves a remainder 842. If the same number is divided by 41, the remainders will be

1. 21                   b. 15                     c. 14                        d. 22                        e. None of these

Q7. Find the unit digit of 7^26

1. 9                 b. 7                         c.3                         d. 1                       e. None of these

Q8. A number is tripled and 14 is subtracted from it. If further resultant is doubled and 7 is added it becomes 21. What is that number

a. 4                         b. 12                       c. 4.3                     d. 7

this question asked by SSC CGL Exam in 2011

Q9.Find the greatest number which divides 285 and 160 leaves remainder 5 and 6 respectively

a. 15                        b. 16                             c. 14                           d. 28

Q10. The HCF of two numbers is 19 and the sum of two numbers is 209. How many such pairs are

a. 2                 b. 4               c. 5                   d. 1                   e . none of these

Q11. The ratio of HCF and LCM is 1:6 and their difference is 500. if one number is 200, find the other

a. 600                   b. 300                 c. 450                     d. 500

Q12. Which of the following numbers is exactly divisible by 15

a.1234565            b. 1234560           c. 12345655             d. 123455               e. None of these

Q13. Sum of two numbers is equal to sum of square of 11 and cube of 9. Larger number is 52 less than square of 2/5. What is the value of the sum of twice of 24 percent of the smaller number and half of the larger number ?

1. 415                  b. 400                 c. 410               d. 425            e. None of these

Q14. The sum of the two digits of a two digit number is 12 and the difference between the two digits of the two digit number is 6. What is the two digit number ?

1. 39                b. 84                   c. 93                  d. Cannot be determined    e. None of these

Q15. Find the missing digit of the number 378 _ 42100, if the number is completely divided by by 300

a. 1                   b. 2                           c. 3                           d. 4

Q16. If 1 is added to the numerator and 1 is subtracted from the denominator, the fraction becomes 1. If 2 is subtracted from the numerator and 3 is added to the denominator, the fraction becomes 1/2. what is the fraction ?

1. 9/11             b. 7/11                 c. 5/11             d. 7/5              e. None of these

Q17. The difference of the digits of a two digit number is 2 and the sum of its digit is 6. The number is 7/4 times of the number obtained by interchanging the digits of original number . what is the original number ?

1. 24                b. 15               c. 42               d. 60                 e. None of these

Q18. The product of the age of Harish and Seema is 240. If twice the age of Seema is more than Harish’s age by 4 years, what is Seema,s age in years ?

1. 12                 b. 20               c. 10                  d. 14               e. none of these

Q19. Which of the following numbers is larger

1. 832                 b. 3216           c. 449             d. 280              e. None of these

Q20. The difference of the squares of two numbers is 225. sum of two numbers is

1. 40                b. 45            c. 50                   d. 52                     e. None of these

Q21. Find the remainder when 1312   divided by 7

1. 1                        b. 2                 c. 3                    d. 4                   e. 5

Q22. Ravi bought equal number of Rs. 45, Rs. 75 and Rs. 95 valued tickets for a classical music show. He spent a sum of Rs. 3870 for all the tickets. How many of each kind of tickets did he buy ?

1. 18                  b. 19               c. 17                   d. 20                 e. None of these

Q23. Father’s age is 30 years more than the son’s age. Ten years hence, the father’s age will become three times the son’s age that time. What is son’s present age ( in years) ?

1. 8             b. 7          c. 5          d. Cannot be determined             e.None of these

Q24. Let x be an odd natural number. If x is divided by 6, it leaves a remainder y. If y2   is divided by 4, it leaves remainder of z. Which of the following must be true for z ?

1. Z = 3                       b. Z = 5                     c. z = 1                       d. Z is even

Q25. 4/15 of 5/7 of a number is greater than 4/9 of 2/5 of the same number by 8. What is half of that number ?

1. 630       b. 315            c. 210                  d. 105                     e. None of these