A father is twice as old as his son 20 years ago, the age of the father was 12 times the age of the son. The present age of the son is.

If + means ÷, -means ×, ÷means + and ×means –, then 36×12+4÷6+2-3 =?

The ratio of milk and water in a mixture is 4:3. If 14 liters of water is added to the mixture, the ratio of milk and water become 3:4. Then the quantity of milk in the mixture is.

At simple interest, in how many years will a sum of money double itself at 12% per annum?

Arjun completes a work in 35 days where as Biju completes the same work in 45 days. If they complete it, together and get a payment of Rs. 3200. What is Biju’s share?

The total number of prime factors in 6²⁰×16¹⁵×21¹² are: