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.
Sandra’s Work:Amount of sugar for 1 cookie: 15 •1C=15 =3.75C
44
Amount of sugar for 90 cookies: 3.75 C • 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.
Answers
Given : Miguel asked Sandra to make 90 cookies for his party. Sandra needs 1/4 cup of sugar to make 15 cookies.
To find : the amount of sugar she will need to make 90 cookies
Solution:
Sandra needs 1/4 cup of sugar to make 15 cookies
Amount of sugar needed for 15 Cookies = 1/4 Cup
To find Amount of sugar for 1 cookie Sandra was supposed to divide by 15 but she multiplied by 15
Amount of sugar needed for 1 Cookies = (1/4 )/15 Cup
=> Amount of sugar needed for 1 Cookies = 1/60 cup
Amount of sugar needed for 90 Cookies = 90 * 1/60 cup
= 3/2
= 1.5 cups
1.5 cups Sugar amount needed to make 90 cookies
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