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the sum of the ages of a mother and daughter is 75 and the difference in their ages is 29 years. how old is each?
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Let m = mother's age, d = daughter age. Then
m + d = 75,
m - d = 29.
Add these equation. You will get
2m = 75 + 29 = 104.
What to do next?
Solve yourselve the problem from this point.