document.write( "Question 1041878: Andy says my mother is 9 times as old as i am. In 3 years she will be only five times as old as i will be. How old am i? \n" ); document.write( "

Algebra.Com's Answer #656813 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+a+\"$ = Andy's age now
\n" ); document.write( "Let $\"+b+\"$ = Andy's mother's age now
\n" ); document.write( "--------------------------------
\n" ); document.write( "(1) $\"+b+=+9a+\"$
\n" ); document.write( "(2) $\"+b+%2B+3+=+5%2A%28+a+%2B+3+%29+\"$
\n" ); document.write( "--------------------------
\n" ); document.write( "Substitute (1) into (2)
\n" ); document.write( "(2) $\"+9a+%2B+3+=+5%2A%28+a+%2B+3+%29+\"$
\n" ); document.write( "(2) $\"+9a+%2B+3+=+5a+%2B+15+\"$
\n" ); document.write( "(2) $\"+4a+=+12+\"$
\n" ); document.write( "(2) $\"+a+=+3+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+b+=+9a+\"$
\n" ); document.write( "(1) $\"+b+=+9%2A3+\"$
\n" ); document.write( "(1) $\"+b+=+27+\"$
\n" ); document.write( "---------------
\n" ); document.write( "Andy is 3 now
\n" ); document.write( "---------------
\n" ); document.write( "check:
\n" ); document.write( "(2) $\"+b+%2B+3+=+5%2A%28+a+%2B+3+%29+\"$
\n" ); document.write( "(2) $\"+27+%2B+3+=+5%2A%28+3+%2B+3+%29+\"$
\n" ); document.write( "(2) $\"+30+=+5%2A6+\"$
\n" ); document.write( "(2) $\"+30+=+30+\"$ \n" ); document.write( "

\n" );