Question

A recipe uses 2 cups of flour for 18 brownies. How many cups of flour are used for 40 brownies?

Answer 1

See a solution process below:

Explanation:

We can write a ratio to solve this as:

`(2"cups")/(18"brownies") = c/(40"brownies")`

`color(red)(40)color(red)("brownies") xx (2"cups")/(18"brownies") = color(red)(40)color(red)("brownies") xx c/(40"brownies")`

`color(red)(40)cancel(color(red)("brownies")) xx (2"cups")/(18color(red)(cancel(color(black)("brownies")))) = cancel(color(red)(40)color(red)("brownies")) xx c/color(red)(cancel(color(black)(40"brownies")))`

`color(red)(40) xx (2"cups")/18 = c`

`(80"cups")/18 = c`

`4.bar4"cups" = c`

`c = 4.bar4"cups"`

40 brownies would require approximately 4.4 or `4 4/9` cups.