Question

Mr. Willams’ physical education class lasts 7/8 hour. How many minutes are not spent on instructions? Explain

Answer 1

42 minutes are not spent on instructions

Explanation:

First, we must find out how many minutes is in
`(7)/(8)` hour

`60*(7)/(8)=(60*7)/(8) =(420)/(8) =52.5`

In
`(7)/(8)` hour, there is about 52
`(1)/(2)` minutes

Then we must add up the fractions that are NOT the instructions

`(1)/(2) +(3)/(10) =(5)/(10) +(3)/(10) =(8)/(10) =(4)/(5)`

`(4)/(5)` of the total time (52
`(1)/(2)` minutes) is not spent on instructions

Then we must multiply the fraction of time spent on other things (
`(4)/(5)`) by total time (52
`(1)/(2)` minutes) in order to find out how many minutes weren't spent on instructions.

`(4)/(5)*52 (1)/(2) =(4)/(5)* (105)/(2)=(420)/(10) =42`

42 minutes are not spent on instructions