Question

Jack and Glen share a 30-ounce box of cereal. By the end of the week, Jack has eaten

1
10
of the box, and Glen has eaten
2
5
of the box of cereal. How many ounces are left in the box?

Answer 1

15 oz

Explanation:

1/10 of 30 = 30/10 = 3 oz

2/5 of 30 = 30 * 2/5 = 60/5 = 12 oz

add those up to get 3 + 12 = 15 oz eaten

there are thus 30-15 = 15 oz left in the box