Question

The container that holds the water for the football team is 1/2 full. After pouring in 3 gallons of water, it is 7/10 full. How many gallons can the container hold?

Answer 1

make the bottom number the same to find the increase

find the increase
from 1/2 to 7/10
1/2 times 5/5=5/10
from 5/10 to 7/10 is 2/10 or 1/5 increase
3 gallons was added
so 3 gallons=1/5 of the container
times 5/1 both sides
15 gallons=5/5 of the container

the container can hold 15 gallons of water