Question

You use 4 boxes of rice to serve 13 people. If you want to serve 39 people, what should you do?

Answer 1

YOU SHOULD MAKE MORE RICE
3x's more rice!

Answer 2

Use
`3` times as many boxes of rice

Explanation:

we know that

Using proportion

`(4)/(13)(boxes)/(people)=(x)/(39)(boxes)/(people) \\ \\x=39*4/13\\ \\x=12\ boxes`

original quantity of boxes ----->
`4`

boxes needed ----->
`12`

`12=3*(4)`

therefore

Use
`3` times as many boxes of rice