Question

Sherry spent 90 minutes completing her homework last night. Of these minutes 1/3 of them were spent on math . How many minutes did Sherry spent on her math homework?

Answer 1

30 minutes

Explanation:

In this context, "of" means "times". 1/3 of 90 minutes means ...

... (1/3) × 90 minutes = 90/3 minutes = 30 minutes