How to solve it by Math equation

Hi Math Experts,

The Mom is 21 years older than the child. In 6 years from now the mom will be 5 times as old as the child.
Where’s the father?
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Chris MillardCommented:
I don't get it...
The child's age is negative
double equation system:
transpose to second equation:
The baby will be born in 9 months, thus the father is on top of the mother.

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on top
not necessarily
If you go into that, then maybe he isn't even there yet. Maybe the baby is premature and won't be conceived for another month or two. :P
The point is, the father is, mathematically, conceiving the baby.
Technically, even a full term baby is conceived only 8.5 months before birth. They typically count the months of pregnancy since the woman's last menstrual cycle since that's easier to determine. But the woman usually ovulates about 2 weeks after her cycle which is when conception can happen.

The question is supposed to be a tasteful but adult joke because the -9 month age implies the couple is together but (like many jokes) you have to make rash and inaccurate assumptions for it to work properly.
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