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Rudiy27
3 years ago
7

Priya has completed 9 exam questions. This is 60% of the questions on the exam. How many questions are on the exam?

Mathematics
1 answer:
USPshnik [31]3 years ago
8 0

the whole exam will be 100%, and let's say that's "x" questions, but we also know that 9 is 60% of that so

\bf \begin{array}{ccll} amount&\%\\ \cline{1-2} x&100\\ 9&60 \end{array}\implies \cfrac{x}{9}=\cfrac{100}{60}\implies \cfrac{x}{9}=\cfrac{5}{3}\implies 3x=45 \\\\\\ x=\cfrac{45}{3}\implies x=15

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