You can put this solution on YOUR website! c= cassidy's current age
c+8 = cassidy's age in 8 yr
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d = drew's current age
d+8 = drew's age in 8 yr
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c = 3*d
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c+8 = 2*(d+8)
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substitute c = 3d
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3d + 8 = 2d + 16
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d = 8
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c = 3(8) = 24
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Check the relationship in 8 years.
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c+8 = 32
d+8 = 16
So c = 2d, which is correct.
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Answer: Cassidy is 24; Drew is 8.
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Done.