The smallest positive integer when multiplied by 392, the product is a perfect square, is 

The present age of father and son are in the ratio 3: 1. After 20 years the ratio becomes 2 : 1 . Find the present age of the father. 

The radius of a circular field is equal to the side of a square field whose perimeter is 784 feet. What is the area o the circular field?

What will be compound interest on a sum of Rs. 1000 at the rate of interest 10% after 5 years?

A bookseller allowed 10 % discount on printed price. He gets 30 % commission from publisher. His profit in percent will be 

A sum of money amounted to Rs.720 in 2 years and Rs.792 in 3 years when interest is compounded annually. The annual rate of interest , (in%) is:

The ratio of 45% of 80% of A to 30% of 40% of B is 15: 4. If the average of A and B is 67.5, what is the value of AB?

A rectangular ground 16m long and 10m breadth. It has a gravel path 2.5m wide all around it on the outside. What is the area of the path?