document.write( "Question 762825: A father is three times as old as his son. in 12 years time, he will be twice as old as his son . find the present age of the father and the son
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Algebra.Com's Answer #464218 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+f+\"$ = father's age now
\n" ); document.write( "Let $\"+s+\"$ = son's age now
\n" ); document.write( "given:
\n" ); document.write( "(1) $\"+f+=+3s+\"$
\n" ); document.write( "(2) $\"+f+%2B+12+=+2%2A%28+s+%2B+12+%29+\"$
\n" ); document.write( "-------------------------
\n" ); document.write( "(2) $\"+f+%2B+12+=+2s+%2B+24+\"$
\n" ); document.write( "(2) $\"+f+-+2s+=+12+\"$
\n" ); document.write( "Substitute (1) into this
\n" ); document.write( "(2) $\"+3s+-+2s+=+12+\"$
\n" ); document.write( "(2) $\"+s+=+12+\"$
\n" ); document.write( "and, since
\n" ); document.write( "(1) $\"+f+=+3s+\"$
\n" ); document.write( "(1) $\"+f+=+3%2A12+\"$
\n" ); document.write( "(1) $\"+f+=+36+\"$
\n" ); document.write( "The son is 12 and the father is 36
\n" ); document.write( "check:
\n" ); document.write( "(2) $\"+f+%2B+12+=+2%2A%28+s+%2B+12+%29+\"$
\n" ); document.write( "(2) $\"+36+%2B+12+=+2%2A%28+12+%2B+12+%29+\"$
\n" ); document.write( "(2) $\"+48+=+2%2A24+\"$
\n" ); document.write( "(2) $\"+48+=+48+\"$
\n" ); document.write( "OK \n" ); document.write( "

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