Nadine collected different colored pebbles. She has 20 white pebbles and half as many red pebbles. How many pebbles does she have in all?
Nadine has 20/2 = <T>divide(20, 2)=10.0 red pebbles.
Thus, she has 20 + 10 = <T>add(20, 10)=30 pebbles.
