Answer the following question, with explanation first.
Adah practiced the cello for a total of 7.5 hours last week. He practiced for 86 minutes on each of 2 days. How many minutes in total did he practice on the other days?

278
7.

5 hours = 450 minutes.

Two days = 2 * 86 = 172 minutes.

450 - 172 = 278 minutes.

Adah practiced a total of 278 minutes on the other days.

.

Thus, the answer is 278