Bendt had $206 and Frederik had $68. After each friend donated an equal amount of money, Bendt had 4 times as much money as Frederik. How much money did each friend donate?

Answer 1

206 - x = 4 (68 - x)
206 - x = 272 - 4x
-x + 4x = 272 - 206
3x = 66
x = 22