document.write( "Question 1101343: Mr. Abu is now three times as old as his son Kofi. if the sum of their ages 8 years ago was 48, find the boy's present age.
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Algebra.Com's Answer #715912 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+a+\"$ = Mr Abu's age now
\n" ); document.write( "Let $\"+b+\"$ = Kofi's age now
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\n" ); document.write( "(1) $\"+a+=+3b+\"$
\n" ); document.write( "(2) $\"+%28+a+-+8+%29+%2B+%28+b+-+8+%29+=+48+\"$
\n" ); document.write( "--------------------------------
\n" ); document.write( "(2) $\"+a+%2B+b+-+16+=+48+\"$
\n" ); document.write( "(2) $\"+a+%2B+b+=+64+\"$
\n" ); document.write( "-----------------------
\n" ); document.write( "Substitute (1) into (2)
\n" ); document.write( "(2) $\"+3b+%2B+b+=+64+\"$
\n" ); document.write( "(2) $\"+4b+=+64+\"$
\n" ); document.write( "(2) $\"+b+=+16+\"$
\n" ); document.write( "-------------------
\n" ); document.write( "Kofi's age is presently 16
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\n" ); document.write( "check:
\n" ); document.write( "(1) $\"+a+=+3%2A16+\"$
\n" ); document.write( "(1) $\"+a+=+48+\"$
\n" ); document.write( "------------------
\n" ); document.write( "(2) $\"+%28+a+-+8+%29+%2B+%28+b+-+8+%29+=+48+\"$
\n" ); document.write( "(2) $\"+%28+48+-+8+%29+%2B+%28+16+-+8+%29+=+48+\"$
\n" ); document.write( "(2) $\"+40+%2B+8+=+48+\"$
\n" ); document.write( "(2) $\"+48+=+48+\"$
\n" ); document.write( "OK \n" ); document.write( "

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