42 raspberries, blackberries, and blueberries were picked in total. If half of all the berries had been raspberries, and a third of the berries were blackberries, how many of them were blueberries?
42/2 = <T>divide(42, 2)=21.0 raspberries had been picked.
42/3 = <T>divide(42, 3)=14.0 blackberries had been picked.
21+14 = <T>add(21, 14)=35 raspberries and blackberries had been picked.
42-35 = <T>subtract(42, 35)=7 blueberries had been picked.
