1. Find the product of 251 and 80.

2. 3 pies were shared equally among 5 children. How many pies did 2 children receive?

3. Ahmad and Ravi had the same number of marbles at first. After Ahmad gave away 35 of his marbles and Ravi lost 5 of his marbles, Ravi had thrice as many marbles as Ahmad. How many marbles did Ahmad have in the end?

4. A baker bought 4 kg of flour. He used 2/5 kg on Monday and 1/2 kg on Tuesday. How many kilograms of flour did he have left?