document.write( "Question 1123277: tom's father is thrice as old as Tom.10 years ago Tom's father's age was 7 times his age. What is Tom's current age ? \n" ); document.write( "

Algebra.Com's Answer #739587 by josmiceli(19441) $\"\"$ $\"About$

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Let Tom痴 present age = $\"+a+\"$
\n" ); document.write( "Let Tom痴 father痴 present age = $\"+b+\"$
\n" ); document.write( "覧覧覧覧-
\n" ); document.write( "(1) $\"+b+=+3a+\"$
\n" ); document.write( "(2) $\"+b+-+10+=+7%2A%28+a+-+10+%29+\"$
\n" ); document.write( "覧覧覧覧覧覧覧
\n" ); document.write( "Plug (1) into (2)
\n" ); document.write( "(2) $\"+3a+-+10+=+7a+-+70+\"$
\n" ); document.write( "(2) $\"+4a+=+60+\"$
\n" ); document.write( "(2) $\"+a+=+15+\"$
\n" ); document.write( "Tom is 15 now
\n" ); document.write( "覧覧覧覧-
\n" ); document.write( "Check:
\n" ); document.write( "(1) $\"+b+=+3%2A15+\"$
\n" ); document.write( "(1) $\"+b+=+45+\"$
\n" ); document.write( "And
\n" ); document.write( "(2) $\"+b+-+10+=+7%2A%28+a+-+10+%29+\"$
\n" ); document.write( "(2) $\"+b+=+7%2A5+%2B+10+\"$
\n" ); document.write( "(2) $\"+b+=+45+\"$
\n" ); document.write( "OK
\n" ); document.write( " \n" ); document.write( "

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