Mother and daughter

Three years ago mother was three times older than daughter. After nine years she will be only twice old.

How old is mother (and daughter)?

Correct result:

m =  39
d =  15

Solution:


m-3=3(d-3)
m+9=2(d+9)

m-3=3•(d-3)
m+9=2•(d+9)

3d-m = 6
2d-m = -9

d = 15
m = 39

Our linear equations calculator calculates it.



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