Question

Bobby has 3 times as many model spaceships as his friend Sylvester does. Bobby has 21 spaceships. How many model spaceships does Sylvester have?

Answer 1

he has seven models because 21 divided by 3 is seven

Answer 2

set the problem up like this:
3•X=21
then divide both sides by 3 and you get:
Sylvester has 7 spaceships