A mother

A mother is three times older than her daughter. 9 years ago, mom was 6 times older than her daughter. How old are a mother and daughter now?

Correct result:

d =  15
m =  45

Solution:


m=3d
m-9 = 6(d-9)

m=3•d
m-9 = 6•(d-9)

3d-m = 0
6d-m = 45

d = 15
m = 45

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