Question

4. Miguel asked Sandra to make 90 cookies for his party. Sandra needs a cup of sugar to make
15 cookies. She incorrectly calculated the amount of sugar she will need.
Sandra's Work:
Amount of sugar for 1 cookie: 15
C = = 3.75C
Amount of sugar for 90 cookies: 3.75 0.90 = 337.5 C
Write a brief note to Sandra describing her mistake and explain to her how to correctly
determine the amount of sugar she will need.

Answer 1

First, you need to divide 90 by 15, getting 6.

Then, you need to multiply 6 by 1, getting 6.

Therefore, you'll need 6 cups of sugar to make 90 cookies.