Discussion
If 15% of a number is 90, find the number.
Answer: C
The number is 600.
If 15% of the number is 90, then:
\[ \begin{aligned} \frac{15}{100} \times x &= 90 \\ x &= \frac{90 \times 100}{15} = 600 \end{aligned} \]
Check: 10% of 600 is 60 and 5% is 30, which make 90. 500 gives 75, 550 gives 82.5 and 650 gives 97.5, so none of them has 90 as its 15%.
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