document.write( "Question 996285: The sum of the persentage age of a father and his daughter is 42 years.7 years later, the father will be three times older than the daughter. the present age of the daughter is?
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Algebra.Com's Answer #614784 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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The sum of the present age of a father and his daughter is 42 years.
\n" ); document.write( "f + d = 42
\n" ); document.write( "f = 42 - d
\n" ); document.write( "7 years later, the father will be three times older than the daughter.
\n" ); document.write( "f + 7 = 3(d + 7)
\n" ); document.write( "f + 7 = 3d + 21
\n" ); document.write( "f = 3d + 21 - 7
\n" ); document.write( "f = 3d + 14
\n" ); document.write( "Replace f with (42-d)
\n" ); document.write( "42 - d = 3d + 14
\n" ); document.write( "42 - 14 = 3d + d
\n" ); document.write( "28 = 4d
\n" ); document.write( "d = 28/4
\n" ); document.write( "d = 7 yrs is the present age of the daughter
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\n" ); document.write( "You can check the solution yourself, find f and use these ages in the 2nd statment \n" ); document.write( "

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