3. The sum of two numbers is 75 and their difference is 20. Find the difference of their squares.
2. A number when divided by 899 gives a remainder 63. What remainder will be obtained by dividing the same number by 29.
1. A man spends 1/5 of his salary on food, 1/10 of his salary on house rent and 3/5 of his salary on clothes. He still has $18000 left with him. Find his salary.