document.write( "Question 752624: The ratio of sam's age to his father's is 1:3. In five years, Sam's age will be 3/7 of his father's age. What is the age difference of Sam and his father? \n" ); document.write( "
Algebra.Com's Answer #457954 by ankor@dixie-net.com(22740)\"\" \"About 
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The ratio of sam's age to his father's is 1:3.
\n" ); document.write( " In five years, Sam's age will be 3/7 of his father's age.
\n" ); document.write( " What is the age difference of Sam and his father?
\n" ); document.write( ":
\n" ); document.write( "Let x = the multiplier
\n" ); document.write( "then
\n" ); document.write( "1x = age of sam
\n" ); document.write( "and
\n" ); document.write( "3x = age of father
\n" ); document.write( ":
\n" ); document.write( "\"In five years, Sam's age will be 3/7 of his father's age.\"
\n" ); document.write( "\"%28%28x%2B5%29%29%2F%28%283x%2B5%29%29\" = \"3%2F7\"
\n" ); document.write( "Cross multiply
\n" ); document.write( "3(3x+5) = 7(x+5)
\n" ); document.write( "9x + 15 = 7x + 35
\n" ); document.write( "9x - 7x = 35 - 15
\n" ); document.write( "2x = 20
\n" ); document.write( "x = 20/2
\n" ); document.write( "x = 10 is the multiplier
\n" ); document.write( "then
\n" ); document.write( "3(10) = 30 yrs is Dad's age
\n" ); document.write( "1(10) = 10 yrs is Sam's age
\n" ); document.write( "----------------------------
\n" ); document.write( "Age dif: 20 yrs\r
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