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- Four years ago, Jane was twice as old as Sam. Four years on from now, Sam will be 3/4 of Jane's age. How old is Jane now?
- (Jane - 4) = 2Sam
- (Jane + 4 * 3/4) = Sam
- 3/4Jane + (4 * 3/4) = Sam
- 3/4Jane + 3 = Sam
- Jane - 4 = 2(3/4Jane + 3)
- Jane - 4 = 3/2Jane + 6
- Jane = 3/2Jane + 10
- 0 = 1/2Jane + 10
- 1/2Jane = -10
- Jane = -20
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