Maths
posted by Anonymous .
a mother is three times as old as her daughter five years later the mother will be two and a half times as old as her daughter and find their present ages

Maths 
PsyDAG
M = 3D
M+5 = 2.5(D+5)
Substitute 3D for M in the second equation and solve for D. Insert that value into the first equation to solve for M. Check by putting both values into the second equation.
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