Question

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?

Answer 1

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