Surface area.
25/5 = 5 100/5 = 20 20 + 20 + 20 + 5 = 65
5/0.25 = 20
20/5 = 4
9 they are -20, -15, -10, -5, 0, 5, 10, 15, 20.
5/10
It is: 20/5 = 4 times
The whole volume of blood in the body, about 5 litres on average. But may rise in exercise to many folds, depending on fitness.
20
20
25
5 gallons = 20 quarts