SOLUTION: Madam Ling was 28 years old when her son was born. If the product of their ages now is 480,how old is her son now?

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Question 724030: Madam Ling was 28 years old when her son was born. If the product of their ages now is 480,how old is her son now?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Madam Ling was 28 years old when her son was born.
If the product of their ages now is 480, how old is her son now?
:
Let s = son's age now
we know
s + 28 = Ling's age now
then the product of their ages:
s(s+28) = 480
s^2 + 28s - 480 = 0
Factors to
(s+40)(s-12) = 0
the positive solution
s = 12 yrs old is the son's present age
:
:
Check this yourself, find Ling's age and multiply by 12