document.write( "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? \n" ); document.write( "

Algebra.Com's Answer #443558 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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Madam Ling was 28 years old when her son was born.
\n" ); document.write( " If the product of their ages now is 480, how old is her son now?
\n" ); document.write( ":
\n" ); document.write( "Let s = son's age now
\n" ); document.write( "we know
\n" ); document.write( "s + 28 = Ling's age now
\n" ); document.write( "then the product of their ages:
\n" ); document.write( "s(s+28) = 480
\n" ); document.write( "s^2 + 28s - 480 = 0
\n" ); document.write( "Factors to
\n" ); document.write( "(s+40)(s-12) = 0
\n" ); document.write( "the positive solution
\n" ); document.write( "s = 12 yrs old is the son's present age
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check this yourself, find Ling's age and multiply by 12
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