Martha has 11 butterflies in her collection. She has twice as many blue butterflies as yellow butterflies. The rest of her butterflies are black. If Martha has 5 black butterflies, how many blue butterflies does she have?
Martha has 11-5=<T>subtract(11, 5)=6 blue and yellow butterflies.
Martha has 6/3=<T>divide(6, 3)=2.0 yellow butterflies.
Martha has 2*2=<T>multiply(2, 2)=4 blue butterflies.
