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?
7.5 hours = 
<gadget id="calculator">7.5*60</gadget>
<output>450</output>
450 minutes.
Two days = 2 * 86 = 172 minutes
450 - 172 = 
<gadget id="calculator">450-172</gadget>
<output>278</output>
278 minutes.
Adah practiced a total of 278 minutes on the other days.

<result>278</result>