Question: 5736

A mother is 21 years older than a child.
In 6 years, the mother will be five times more than the child.
Question: Where's Dad?

Correct answer:

d =  -0.75
m =  20.25

Step-by-step explanation:


m=d+21
m+6 = 5(d+6)

m=d+21
m+6 = 5·(d+6)

d-m = -21
5d-m = -24

Pivot: Row 1 ↔ Row 2
5d-m = -24
d-m = -21

Row 2 - 1/5 · Row 1 → Row 2
5d-m = -24
-0.8m = -16.2


m = -16.2/-0.8 = 20.25
d = -24+m/5 = -24+20.25/5 = -0.75

d = -3/4 = -0.75
m = 81/4 = 20.25

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