Answer:
Let j = amount Jasmine spent, k = amount Karen spent, and m = amount Maggie spent.
m = 3k, k = (1/2)j
j + k + m = $60
2k + k + 3k = $60
6k = $60
k = $10, m = $30, j = $20
Jasmine spent $20, Karen spent $10, and Maggie spent $30.
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