Question

2. You want to buy some beans. A

7-ounce package costs $2.38. A
15-ounce package costs $5.25. A
26-ounce package costs $8.58. Which
package is the best buy?

Answer 1

Explanation:

Remark

If you find out the cost of 1 oz of each of them, that will determine the best buy. The smallest number is the best buy.

Givens

7 oz cost $2.38

15 oz cost $5.25

26 oz cost $8.58

Solution

7 oz

7 oz cost $2.38

1 oz cost x This is a proportion. 3 quatities are known. Find x Cross multiply.

7/1 = 2.38/x

7x = 2.38

x = $0.34 dollars

15 oz

15 oz cost 5.25

1 oz costs x

15.1/1 = 5,25 x Cross Multiply

15x = 5.25 * 1 Divide by 15

x = 5.25 / 15

x = $0.35

26 oz

26 oz cost 8.58

1 oz cost x

26/1 = 8.38/x Cross Multiply

26x = 8.38 Divide by 26

x = 8.38/20

x = 0.32 dollars

Answer

7 oz cost 0.34

15 oz cost 0.35

26 oz cost 0.32

The best buy is 0.32 / oz for 26 oz