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 #739588 by ankor@dixie-net.com(22740)\"\" \"About 
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tom's father is thrice as old as Tom.
\n" ); document.write( "f = 3t
\n" ); document.write( "10 years ago Tom's father's age was 7 times his age.
\n" ); document.write( "f-10 = 7(t-10)
\n" ); document.write( "f - 10 = 7t - 70
\n" ); document.write( "f = 7t - 70 + 10
\n" ); document.write( "f = 7t - 60
\n" ); document.write( "replace f with 3t, from the first statement
\n" ); document.write( "3t = 7t - 60
\n" ); document.write( "3t - 7t = -60
\n" ); document.write( "-4t = -60
\n" ); document.write( "t = -60/-4
\n" ); document.write( "t = +15 yrs is Tom's age
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\n" ); document.write( ":
\n" ); document.write( "Check this in the statement (f=3*15)
\n" ); document.write( "\" 10 years ago Tom's father's age was 7 times his age. \"
\n" ); document.write( "45 - 10 = 7(15 - 10)
\n" ); document.write( "35 = 7(5)
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