Given:
Amy spent $90 at the store.
She spent of her money on food, of her money on school supplies, and of her money on soda.
To find:
How much did she spend on school supplies?
Solution:
According to the given information, Amy spend of her money on school supplies.
Amy spent $90 at the store. So,
Money spend on school supplies =
=
Therefore, Amy spend $15 on school supplies.