SOLUTION: Joan is five years older than Rob, ten years ago the sum of their age was 25, how old are they now..
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Question 899154: Joan is five years older than Rob, ten years ago the sum of their age was 25, how old are they now..
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Answer by harpazo(655) (Show Source): You can put this solution on YOUR website!
Joan's age now = x + 5
Rob's age now = x
(x + 5) - 10 + x - 10 = 25
x + 5 - 10 + x - 10 = 25
2x + 5 - 20 = 25
2x - 15 = 25
2x = 15 + 25
2x = 40
x = 40/2
x = 20
Rob is 20 years old.
Joan is 25 years old.
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