Prove The Logic

18SX mathematic questions


The mother is 21 years older than the child. In 6 years from now the mother will be 5 times as old as the child.

Question : Where's the father?

Try first, before you check the answer below!
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Solution :
----------

The mum is 21 years older than the child.
M = C + 21

In 6 years from now the mum will be 5 times as old as the child.

M + 6 = 5 x (C + 6)

Hence,
C + 21 + 6 = (C + 6) x 5
C + 27 = 5C + 30
-3 = 4C
C = -3/4

The child is -3/4 years old, i.e. it will be born in 9 months.

So right now, the father is on top of the mother.


 

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    11:49 PM

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