Question

Benny can stack 42 cups in 24 seconds. Does this mean he can stack 70 cups in 40 seconds?

Answer 1

Yes, if he keeps stacking the cups at the same rate.

Explanation:

`42` in `24` seconds
`70` in `40` seconds

To examine weather this statement is true or not, just do the cross multiplication:

`42*40=24*70`
`1680=1680`

Therefore, given that he keeps stacking the cups at the same rate, the statement is true.