Maths GK Questions With Answers for Competitive Exams -Part 1

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Maths GK Questions with Answers – Part 1.

1. If 250x = 2500, then find the value of x?
2. Find the odd one out: 31, 41, 51, 61, 71.
3. Out of 32 students, 8 are absent. What per cent of the students are absent?
4. We have a basket full of apples, oranges and mangoes. If 50% are apples, 30% are oranges, and then what per cent are mangoes?
5. Find the least number which when divided by 6, 9 and 18 leave remainder 5 in each case?
6. Find the median of the following numbers: 76, 45, 32, 98, 76, 21, 90.
7. Solve: 14 + 4 x 2 – 8 +6.
8. If Rs 600 is divided between Manu and Sanu in the ratio 1:2, then what is the amount given to Manu?
9. If the cost of 12 notebooks is Rs 312, then what will be the cost of 4 notebooks?
10. Mohan’s father’s age is 5 years more than three times Mohan’s age. Mohan’s father is 44 years old. Find Mohan’s age?

ANSWERS:

1. 10
   [Explanation: 250x = 2500
   x = 2500/250 = 10.]
2. 51, all other numbers are prime numbers.
3. 25%
   [Explanation: Per cent of students who are absent = 8 x 100/32 = 25%]
4. 20%
   [Explanation: Per cent of mangoes = 100 – (50 + 30) = 100 – 80 = 20%]
5. 23
   [Explanation: Here we need to find the LCM of 6, 9 and 18.
   LCM of 6,9,18 is 18. So add 5 to 18, we will get 23.
   Therefore, the least number which leaves a remainder 5 in each case is 23.}
6. 76
   [Explanation: Arrange the given numbers in ascending order.
   21, 32, 45, 76, 76, 90, 98.
   Middle number is the median, so median = 76]
7. 20
   [Explanation: 14 + 4 x 2 – 8 + 6 = 14 + 8 – 8 + 6 = 28 – 8 = 20.]
8. 200
   [Explanation: Amount given to Manu = 600 x 1/3 = Rs 200]
9. 104
   [Explanation: Cost of 12 notebooks = Rs 312
   Cost of 1 notebook = 312/12 = 26
   Cost of 4 notebooks = 26 x 4 = Rs 104.]
10. 13 years
    [Explanation: Let Mohan’s age be x.
    Mohan’s father’s age = 5 + 3x = 44 (given)
    3x = 44 – 5 = 39
    x = 39/3 = 13]