A father is 25 years older than his son. 10 years ago father’s age was 6 times of his son’s age. What is the present age of son?

If 250 is increased to 300, what is the percentage increase?

Choose the odd one out : 4, 16, 6, 24, 8, 64

What is the cube root of 1728?

If n + n + n – 1 = 98. What will be the value of n squarred?

Which of these is a prime number?