The sum of the ages of the father and son is 80 years. If ten years ago the age of father was three times that of his son, find the present age of the son.

The monthly incomes of two persons are in the ratio 4:5 and their monthly expenditures are in the ratio of 7:9...

Simple interest on a certain sum at the rate of 4.5% p.a. for 4 years and 6 years differs by BDT 216. The sum...

If the product of three consecutive integers is 210, then the sum of integers is

In a right triangle, the length of one of the legs is 3 and the length of the hypotenuse is 5. What is the len...

If x = a + and y = a – then x + y - 2x²y² = ?

The present ratio of students to teachers at a certain school is 30 to 1. If the student enrollment were to in...