Question

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?

Answer 1

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=(106)/(100)x`


`159=(53)/(50)x`


`159*50=53x`


`159*50=53x`


`7950=53x`


`150=x`