Beth is making fruit salad. She adds 5 grapes for every 2 strawberries. If she uses 16 strawberries, how many grapes will she use?

2:16=8

8*5=40

40 grapes

Use a proportion.

Let the unknown number of grapes be x.

5 grapes to 2 strawberries equals x grapes to 16 strawberries.

5/2 = x/16

Cross multiply

2x = 5 * 16

2x = 80

Divide both sides by 2

x = 40

Answer: She will use 40 grapes.