Question

miguel asked sandra to make 90 cookies for his party.sandra needs 1/4 cup of sugar to make 15 cookies. She incorrectly calculated the amount of sugar she will need.

Answer 1

15 cookies ------------------------- 1/4 cup of sugar

90 cookies ------------------------ x

(90 x 1/4) / 15

x = 22.5 /15

x = 1.5 cups

In the first step she did a multiplication but it's a division.