Question

There are 3/4 of a box of cereal remaining. You dat 2/5 of the remaining cereal. What fraction of the box did you eat?

Answer 1

Greetings!

"There are 3/4 of a box of cereal remaining. You eat 2/5 of the remaining cereal. What fraction of the box did you eat?"...

You can solve this by multiplying the fractions by each other (Numerator by numerator, denominator by denominator.)
$=3/4*2/5$
$=6/20$
or
$=3/10$

You ate 3/10ths of the entire cereal box.

Hope this helps.
-Benjamin

Answer 2

You ate 9/40 of the box.