Question

You are selling brownies and cookies at a bake sale. Today you sold 10 baked goods and made $20. Each cookie cost 1.25 and each brownie cost $2.50. How many cookies did you sell

Answer 1

b + c = 10

2.50b + 1.25c = 20

2.50(10 - c) + 1.25c = 20

25 - 2.50c + 1.25c = 20

25 - 1.25c = 20

1.25c = 5

c = 4 cookies

b = 10 - 4 = 6 brownies