Barbara answered 72 questions correctly on her test. If her score on the test was 80%, how many questions were on the test?

Mathematics

2 answers:

Pani-rosa [81]2 years ago

5 0

Answer is B - 90
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elena55 [62]2 years ago

5 0

For a percentage question setup is like this:
part = percentage * whole

part = 72
percentage = 80% = 0.8

72 = 0.8 * whole
whole = 72/0.8 = 90

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We then know that x*y =25

We also know that x*2-5=y (number number of rows is five less than twice the number of desks in each row)

So we substitute: x*(x*2-5)=25
putting numbers out of the brackets:
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