Question

Mr.Williams physical education class lasts 7/8 hour if instruciton is 1/5 how many minutes are not spent on instruction?

Answer 1

Find out the how many minutes are not spent on instruction.

To prove

Let us assume that the numbers of hours Mr. Williams is not instruciton be x.

As given

`Mr.Williams\ physical\ education\ class\ lasts\ (7)/(8)\ hour\ if\ instruciton\ is\ (1)/(5) .`

Than the equation becomes

`x = (7)/(8) - (1)/(5)`

L.C.M of (8,5) = 40

`x = (7* 5 - 1* 8)/(40)`

`x = (35 - 8)/(40)`

`x = (27)/(40)`

`x = (27)/(40)\ hours`

As 1 hours = 60 mintues

`Now\ convert\ (27)/(40)\hours\ into\ mintues.`

`= (27* 60)/(40)`

= 40.5 mintues

Therefore in 40.5 mintues Mr. Williams not spent on instruction .