A measuring cylinder, containing 300 ml of water, put three steel balls with equal radius, and the water surface rises to 360 ml How many steel balls do you need to put to reach the 500ml mark of the measuring cylinder?

A measuring cylinder, containing 300 ml of water, put three steel balls with equal radius, and the water surface rises to 360 ml How many steel balls do you need to put to reach the 500ml mark of the measuring cylinder?

The volume of three steel balls is 360-300 = 60cm & # 179;
Each steel ball: 60 / 3 = 20cm & # 179;
500-300 divided by 20 is 10, so put 10