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Alona [7]
3 years ago
11

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

Mathematics
2 answers:
34kurt3 years ago
8 0
= 7/8 − 1/5

= ((7 × 5) − (1 × 8)) / (8 × 5)

= (35 - 8) / 40

= 27/40

= 27/40

SO, 27/40 minutes are NOT spend on instructions.

Hope I helped:P
makvit [3.9K]3 years ago
5 0

Answer

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\ \frac{7}{8}\ hour\ if\ instruciton\ is\ \frac{1}{5} .

Than the equation becomes

x = \frac{7}{8} - \frac{1}{5}

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

x = \frac{7\times 5 - 1\times 8}{40}

x = \frac{35 - 8}{40}

x = \frac{27}{40}

x = \frac{27}{40}\ hours

As 1 hours = 60 mintues

Now\ convert\ \frac{27}{40}\hours\ into\ mintues.

= \frac{27\times 60}{40}

= 40.5 mintues

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


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