document.write( "Question 234487: five years ago a man was seven times as old as his son. five years hence, the father will be three times as old as his son. find their present age? \n" ); document.write( "
Algebra.Com's Answer #172941 by ankor@dixie-net.com(22740)\"\" \"About 
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let m = man's present age
\n" ); document.write( "let s = son's present age
\n" ); document.write( ":
\n" ); document.write( "Write an equation for each statement:
\n" ); document.write( ":
\n" ); document.write( "\"five years ago a man was seven times as old as his son.\"
\n" ); document.write( "m - 5 = 7(s - 5)
\n" ); document.write( "m - 5 = 7s - 35
\n" ); document.write( "m = 7s - 35 + 5
\n" ); document.write( "m = 7s - 30
\n" ); document.write( ":
\n" ); document.write( "\" five years hence, the father will be three times as old as his son.\"
\n" ); document.write( "m + 5 = 3(s + 5)
\n" ); document.write( "m + 5 = 3s + 15
\n" ); document.write( "m = 3s + 15 - 5
\n" ); document.write( "m = 3s + 10
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\n" ); document.write( " find their present age?
\n" ); document.write( "Using the first statement to replace m in the 2nd statement
\n" ); document.write( "7s - 30 = 3s + 10
\n" ); document.write( "7s - 3s = 10 + 30
\n" ); document.write( "4s = 40
\n" ); document.write( "s = 10
\n" ); document.write( ":
\n" ); document.write( "I'll let you find the man's age, check the solutions in both statements. \n" ); document.write( "
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