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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?

Sagot :

Scryt
It means that her height in this year is [tex]106\%x[/tex] in regards to the last year, where x is her height in last year, so:

[tex]159=106\%x[/tex]

[tex]159=\frac{106}{100}x[/tex]

[tex]159=\frac{53}{50}x[/tex]

[tex]159*50=53x[/tex]

[tex]159*50=53x[/tex]

[tex]7950=53x[/tex]

[tex]150=x[/tex]
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