Answer:
The fraction of cookies I need to bake is 5/8
Step-by-step explanation:
1. Let's check all the information given to answer the question properly:
Total number of cookies needed for the bake sale = 8 1/2 dozen
Two friends will bake 1/4 of the cookies
Sister will bake 1/8 of the cookies
2. What fraction of the cookies do you need to bake?
Let's find the fraction of the cookies I need to bake:
1 - 1/4 - 1/8
We can write 1 as 4/4 or 8/8 for finding the lowest common denominator
8/8 - 2/8 - 1/8
(8 - 2 - 1)/8 = 5/8
The fraction of cookies I need to bake is 5/8
