document.write( "Question 1099588: Amy is now four times as old as Anna. Ten years from now she will be only twice as old Anna is then. How old are they now? Thank you \n" ); document.write( "

Algebra.Com's Answer #714020 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+a+\"$ = Amy's age now
\n" ); document.write( "Let $\"+b+\"$ = Anna'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( "Plug (1) into (2)
\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( "-----------------
\n" ); document.write( "Amy is 20
\n" ); document.write( "Anna is 5
\n" ); document.write( "-----------------
\n" ); document.write( "check:
\n" ); document.write( "(2) $\"+a+%2B+10+=+2%2A%28+b+%2B+10+%29+\"$
\n" ); document.write( "(2) $\"+20+%2B+10+=+2%2A%28+5+%2B+10+%29+\"$
\n" ); document.write( "(2) $\"+30+=+2%2A15+\"$
\n" ); document.write( "(2) $\"+30+=+30+\"$
\n" ); document.write( "OK \n" ); document.write( "

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