In a class of 50 students, 10 did not opt for math, 15 did not opt for science and 2 did not opt for either. How many students of the class opted for both math and science?

If the sum of five consecutive positive integers is A, then the sum of the next five consecutive integers in t...

If d= c-b/a-b, then b =?

A room contains 200 people, 25% of whom are graduates. A group of people, 30% of whom are graduates, leave the...

How many tiles, each a square tile of 2 inch sides, are needed to cover a rectangle floor of 4 feet long and 6...

There are three different roads from Shah Bag to Farm Gate and 4 different roads from Farm Gate to Banani. How...

You are to arrange 36 identical chairs in rows such that there is same number of chairs in each row. Each row...