SOLUTION: Michelle, at present, is 3 times as old as her daughter. In 10 years' time she will be twice her daughter's age. How old is she now?

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Question 985316: Michelle, at present, is 3 times as old as her daughter. In 10 years' time she
will be twice her daughter's age. How old is she now?
Answer by Edwin McCravy(20056) About Me  (Show Source):
You can put this solution on YOUR website!
Michelle, at present, is 3 times as old as her daughter. 

M = 3D

In 10 years' time she [Michelle] wil be twice her daughter's age. 

In 10 years' time she [Michelle] will be M+10
In 10 years' time the daughter will be D+10

So

M+10 = 2(D+10)

To get the answer, solve this system of equations by substitution:

system%28M=3%2AD%2CM%2B10=2%28D%2B10%29%29

Edwin