Question

Mrs.Onusko made 60 cookies for a bake sale.She sold 2/3 of them and gave 3/4 of the remaining cookies to the students working at the sale.how many cookies did she have left?

Answer 1

5 cookies left

Explanation:

1. take the number of cookies made and find how many is in each third (#cookies / 3) = 60/3 = 20
2. find the number of cookies sold = 20*2 = 40
3. find the number of cookies Mrs. Onusko has left after the bake sale (number of cookies made - number of cookies sold) = 60 - 40 = 20
4. find how many cookies are in each fourth of the leftover cookies (#of cookies left / 4) = 20/4 = 5
5. find the number of cookies Mrs. Onusko gives to the sale workers = 5*3 = 15
6. find number of cookies Mrs. Onusko has left (number of cookies left after sale - number of cookies given to the sale workers) = 20 - 15 = 5

Number of cookies left = 5