20 students plays football and 16 students plays hockey. it is found that 10 students plays both game. find the number of students playing at least one game

If 1 km = 0.621 miles, how many miles are in a centimeter

What is the value of r of the geometric series?

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.