Daughter 3610

A mother is six times older than her daughter. The mother will be twice as old as the daughter in twenty years. How old is the mother, and how many are the daughter?

Correct answer:

d =  5
m =  30

Step-by-step explanation:


m=6d
m+20 = 2·(d+20)

m=6·d
m+20 = 2·(d+20)

6d-m = 0
2d-m = -20

Row 2 - 2/6 · Row 1 → Row 2
6d-m = 0
-0.67m = -20


m = -20/-0.66666667 = 30
d = 0+m/6 = 0+30/6 = 5

d = 5
m = 30

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