document.write( "Question 286003: The age of the father is 3 years more than 3 times the age of son. After 3 years the age of the father will be 10 years more then twice the age of the son. Find their present ages? \n" ); document.write( "
Algebra.Com's Answer #207533 by ankor@dixie-net.com(22740)\"\" \"About 
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The age of the father is 3 years more than 3 times the age of son.
\n" ); document.write( " After 3 years the age of the father will be 10 years more then twice the age of the son.
\n" ); document.write( " Find their present ages?
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\n" ); document.write( "Let f = father's present age
\n" ); document.write( "Let s = son's present age
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\n" ); document.write( "Write an equation for each statement:
\n" ); document.write( ":
\n" ); document.write( "\"The age of the father is 3 years more than 3 times the age of son.\"
\n" ); document.write( "f = 3s + 3
\n" ); document.write( ":
\n" ); document.write( "\"After 3 years the age of the father will be 10 years more then twice the age of the son.\"
\n" ); document.write( "f + 3 = 2(s+3) + 10
\n" ); document.write( "f + 3 = 2s + 6 + 10
\n" ); document.write( "f = 2s + 16 - 3
\n" ); document.write( "f = 2s + 13
\n" ); document.write( ":
\n" ); document.write( " Find their present ages?
\n" ); document.write( ":
\n" ); document.write( "Replace f with (3s+3)
\n" ); document.write( "3s + 3 = 2s + 13
\n" ); document.write( "3s - 2s = 13
\n" ); document.write( "s = 13 yrs is the son's age
\n" ); document.write( "then
\n" ); document.write( "f = 2(13) + 13
\n" ); document.write( "f = 39 yrs is father's age
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\n" ); document.write( "Check solution in the statement:
\n" ); document.write( "\"After 3 years the age of the father will be 10 years more then twice the age of the son.\"
\n" ); document.write( "39 + 3 = 2(13+3) + 10
\n" ); document.write( "42 = 2(16) + 10 \n" ); document.write( "
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