Question

Sally needs 480 raspberries to make 4 pies. For each question, explain or show your reasoning. How many raspberries does she need for 10 pies? If Sally uses 720 raspberries. How many pies did she make?

Answer 1

You have to set up a proportion for the first one. for the second question, you can also set up a proportion

Answer 2

Find the rate of the raspberries needed for 1 pie.

480 / 4 = 120 raspberries

1 pie = 120 raspberries.

How many raspberries does she need for 10 pies?

1 pie = 120 raspberries

10 pies = 120 × 10 (since you need 10 berries, you need to multiply the rate by 10)

10 pies = 1200 raspberries are needed.

If Sally uses 720 raspberries. How many pies did she make?

Since you are figuring out the number of pies, you will divide the number of raspberries by the rate of raspberries in one pie.

720 ÷ 120 = 6 pies.