SAT Math Practice Question
In 2015 the populations of City $\mathrm{X}$ and City $\mathrm{Y}$ were equal. From 2010 to 2015, the population of City X increased by $20 \%$ and the population of City $\mathrm{Y}$ decreased by $10 \%$. If the population of City $\mathrm{X}$ was 120,000 in 2010, what was the population of City Y in 2010 ?
- A.60,000
- B.90,000
- C.160,000
- D.240,000
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