Question

Every day, the Lee Pet Store uses 1/3 of a bag of dog food to feed the dogs. How many days

will 1 1/3 bags of dog food last?

Answer 1

1/3bag = 1 day
1/3bag x ? days = 1 1/3 bags
1/3d = 1 1/3 or 4/3
divide each side by 1/3 or multiply each side by its inverse 3/1
1/3 * 3/1 d = 4/3 * 3/1
the 1’s and 3’s cancel each other out on the left and the 3’s cancel each other out on the right.
You are left with d = 4
The food will last 4 days.