A person lost 10% when he sold goods at Rs.153. For how much should he sell them to gain 20%?

The ratio of 9 second to 10 hours is ............

If 2 = 1, 3 = 3, 4 = 12, 5 = 60 then 6 = .............

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