Question

There is 3/4 of a box of cereal remaining. You eat 2/5 of the remaining cereal. What fraction of the box do you eat?

Answer 1

You'll need to multiply (3/4) by (2/5). That's 3(2) 3(1) 3
-------- = ------------- = ------
4(5) 2(5) 10

You eat 3/10 of the box's original contents

Alternatively: (3/4)(2/5) = (3/2)(1/5) = 3/10.