Question

A cookie recipe for 60 cookies calls for 4 cups of flour. How much flour is needed to make 90 cookies?

Answer 1

6 cups of flour

Explanation:

so the recipe says 60 cookies but you need 90.
so ask yourself how do you get from 60 to 90 (what number can you multiply with 60 to get to 90)?
you can set up an equation like this:
`60x=90`

`x=90/60`

`x=3/2`

so to get from 60 to 90 you have to multiply by `3/2` or `1.5`

`3/2` is going to be like a conversion factor

that being said you can use it to find how many cups of flour you'll need for 90 cookies.
so all you have to do is multiply 4 by the conversion factor

so `4/1*3/2=12/2/6`

You will need 6 cups of flour if you are to bake 90 cookies