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Andru [333]
3 years ago
8

A student answers

Mathematics
1 answer:
Marina CMI [18]3 years ago
3 0
So, we have the percentage she gets which is, 90% and the number of questions she answers correctly, which is 27

To find the number of questions in the exam, make an equation
(90% = \frac{90}{100} = 0.9)
\frac{90}{100} = \frac{27}{x}
cross multiply and equate them
90x = 27 x 100
90x = 2700
divide by 90 on either sides to isolate x in order to find the answer
\frac{90x}{90} =  \frac{2700}{90}
90 and 90 cancels out
x = 30
So your final answer will be, there were 30 questions in the exam paper.
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