Sierra spent 2/3 of her earnings on clothes and 1/5 on school supplies. She saved the rest. What fraction of her earnings did she save?

2/3 + 1/5

10/15 + 3/15 = 13/15

15/15 - 13/15 = ?

2/15

2/15 earning

2/15

How is it 2/15 I thought it was 7/15 I don't know

Where does the 15/15 come from?

I thought it was subtractiom