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On my sister's 15th birthday, she was 159 cm in height, having grown 6% since the year before. How tall was she the previous year?

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Scryt

It means that her height in this year is \(106\%x\) in regards to the last year, where x is her height in last year, so:

\(159=106\%x\)

\(159=\frac{106}{100}x\)

\(159=\frac{53}{50}x\)

\(159*50=53x\)

\(159*50=53x\)

\(7950=53x\)

\(150=x\)

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