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I earned twice as much money as my sister. My friend earned four times as much as my sister. The total amount of money the three of us earned is $210.

How much did each of us earn?

Respuesta :

The amount the sister earns =x
The amount I earn = 2x
The amount the friend earns = 4x
4x + 2x + x = 210
7x = 210
x=30
Amount the sister earns = 30
Amount I earn = 2(30) = 60
Amount the friend earns = 4(30) = 120

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