document.write( "Question 426356: A father is nine times the age of his son. In 5 years he will be four times the age of his son. How old are they now? \n" ); document.write( "

Algebra.Com's Answer #853198 by ikleyn(53427) $\"\"$ $\"About$

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\n" ); document.write( "A father is nine times the age of his son. In 5 years he will be four times the age of his son.
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\n" ); document.write( "\n" ); document.write( " The answer in the post by @mananth is incorrect.\r
\n" ); document.write( "\n" ); document.write( " I came to bring a correct solution (including the answer).\r
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document.write( "Son's age x\r\n" );
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document.write( "Father's age 9x\r\n" );
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document.write( "    5 years later\r\n" );
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document.write( "Son's age x +5\r\n" );
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document.write( "Father's age 9x+5\r\n" );
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document.write( "In 5 years, the father's age is four times the son age\r\n" );
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document.write( "   9x + 5 = 4(x+5)\r\n" );
document.write( "   9x + 5 = 4x + 20\r\n" );
document.write( "   5x = 20-5\r\n" );
document.write( "   5x = 15\r\n" );
document.write( "   /5\r\n" );
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document.write( "   x  =  3 years Son's age\r\n" );
document.write( "   9x = 27 years Father's age\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved correctly.\r
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