document.write( "Question 1124133: Kofi is four times as old as kojo, in ten years time kofi will be twice as old as kojo. Find their ages in ten years time? \n" ); document.write( "

Algebra.Com's Answer #740501 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+a+\"$ = Kofi’s age now
\n" ); document.write( "Let $\"+b+\"$ = Kojo’s age now
\n" ); document.write( "—————————————-
\n" ); document.write( "(1) $\"+a+=+4b+\"$
\n" ); document.write( "(2) $\"+a+%2B+10+=+2%2A%28+b+%2B+10+%29+\"$
\n" ); document.write( "———————————————
\n" ); document.write( "By substitution:
\n" ); document.write( "(2) $\"+4b+%2B+10=+2%2A%28+b+%2B+10+%29+\"$
\n" ); document.write( "(2) $\"+4b+%2B+10+=+2b+%2B+20+\"$
\n" ); document.write( "(2) $\"+2b+=+10+\"$
\n" ); document.write( "(2) $\"+b+=+5+\"$
\n" ); document.write( "And
\n" ); document.write( "(1) $\"+a=+4b+\"$
\n" ); document.write( "(1) $\"+a+=+4%2A5+\"$
\n" ); document.write( "(1) $\"+a+=+20+\"$
\n" ); document.write( "And
\n" ); document.write( " $\"+a+%2B+10+=+30+\"$
\n" ); document.write( " $\"+b+%2B+10+=+15+\"$
\n" ); document.write( "Kefir will be 20
\n" ); document.write( "Mojo will be 15
\n" ); document.write( " \n" ); document.write( "

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