document.write( "Question 837799: Jose is 11 years old. Next year he will be 4 times as old as his sister will be then. How many years from now will he be twice as old as his his sister will be them
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Algebra.Com's Answer #504752 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+s+\"$ = Jose's sister's age now
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\n" ); document.write( "(1) $\"+11+%2B+1+=+4%2A%28+s+%2B+1+%29+\"$
\n" ); document.write( "(1) $\"+12+=+4s+%2B+4+\"$
\n" ); document.write( "(1) $\"+4s+=+8+\"$
\n" ); document.write( "(1) $\"+s+=+2+\"$
\n" ); document.write( "His sister is $\"+2+\"$ now
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\n" ); document.write( "Let $\"+n+\"$ = the number of years from now
\n" ); document.write( "when Jose will be twice his sister's age
\n" ); document.write( "(2) $\"+11+%2B+n+=+2%2A%28+2+%2B+n+%29+\"$
\n" ); document.write( "( note that $\"+11+\"$ and $\"+2+\"$ are their present ages )
\n" ); document.write( "(2) $\"+11+%2B+n+=+4+%2B+2n+\"$
\n" ); document.write( "(2) $\"+11+=+4+%2B+n+\"$
\n" ); document.write( "(2) $\"+n+=+7+\"$
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\n" ); document.write( "In 7 years Jose will be twice his sister's age
\n" ); document.write( "check:
\n" ); document.write( "In 7 years, Jose will be $\"+11+%2B+7+=+18+\"$
\n" ); document.write( "In 7 years, his sister will be $\"+2+%2B+7+=+9+\"$
\n" ); document.write( "18 is twice 9
\n" ); document.write( "OK\r
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