26-09-2015
Mathematics

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If 80% is 72 marks, what is full marks

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26-09-2015

I am pretty sure that it is one hundred. bye thanks for me being able to help!

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cleverowl cleverowl

26-09-2015

72 80
—— = ——
x 100

Cross multiply and solve

7200 = 80x

Divide each side by 80

7200 = 80x
——— ——
80 80

And voila x is the answer for full marks

90 = x

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