document.write( "Question 941090: In 1921, Grandpa is 2 times older than Tom in 2000. In 1930, Grandpa is 3 times older than Tom in 2000. What is grandpa age in 2000?\r
\n" ); document.write( "\n" ); document.write( "I'm not sure how to solve this but this is what I did:
\n" ); document.write( "(G = Grandpa age)
\n" ); document.write( "2G=3(G+9) --> 2G=3G+27 -->G=+27 a.k.a G=27 (Age in 1930) -->(2000-1930)+27 = 97 years old in 2000
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Algebra.Com's Answer #573644 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+t+\"$ = Tom's age in 2000
\n" ); document.write( "Let $\"+g+\"$ = grandpa's age in 2000
\n" ); document.write( "-------------------------------
\n" ); document.write( "In 1921, grandpa's age is $\"+g+-+79+\"$
\n" ); document.write( "( 2000 - 1921 = 79 )
\n" ); document.write( "---------------------
\n" ); document.write( "(1) $\"+g+-+79+=+2t+\"$
\n" ); document.write( "---------------------
\n" ); document.write( "In 1930, grandpa's age is $\"+g+-+70+\"$
\n" ); document.write( "( 2000 - 1930 = 70 )
\n" ); document.write( "---------------------
\n" ); document.write( "(2) $\"+g+-+70+=+3t+\"$
\n" ); document.write( "---------------------
\n" ); document.write( "(1) $\"+t+=+%28+g+-+79+%29+%2F+2+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+t+=+%28+g+-+70+%29+%2F+3+\"$
\n" ); document.write( "-----------------------
\n" ); document.write( " $\"+%28+g+-+79+%29+%2F+2+=+%28+g+-+70+%29+%2F+3+\"$
\n" ); document.write( "Multiply both sides by $\"+6+\"$
\n" ); document.write( " $\"+3%2A%28+g+-+79+%29+=+2%2A%28+g+-+70+%29+\"$
\n" ); document.write( " $\"+3g+-+237+=+2g+-+140+\"$
\n" ); document.write( " $\"+g+=+237+-+140+\"$
\n" ); document.write( " $\"+g+=+97+\"$
\n" ); document.write( "grandpa is 97 in 2000
\n" ); document.write( "---------------------
\n" ); document.write( "check:
\n" ); document.write( "(1) $\"+t+=+%28+g+-+79+%29+%2F+2+\"$
\n" ); document.write( "(1) $\"+t+=+%28+97+-+79+%29+%2F+2+\"$
\n" ); document.write( "(1) $\"+t+=+18%2F2+\"$
\n" ); document.write( "(1) $\"+t+=+9+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+t+=+%28+g+-+70+%29+%2F+3+\"$
\n" ); document.write( "(2) $\"+t+=+%28+97+-+70+%29+%2F+3+\"$
\n" ); document.write( "(2) $\"+t+=+27%2F3+\"$
\n" ); document.write( "(2) $\"+t+=+9+\"$
\n" ); document.write( "OK
\n" ); document.write( " \n" ); document.write( "

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