document.write( "Question 1028358: Tony's 17 years old and his father is 50 years old. How many years ago when his father was 4 times Tony's age? \n" ); document.write( "

Algebra.Com's Answer #643436 by ikleyn(52832) $\"\"$ $\"About$

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\n" ); document.write( "Tony's 17 years old and his father is 50 years old. How many years ago when his father was 4 times Tony's age?
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document.write( "Let x = How many years ago . . . \r\n" );
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document.write( "At that time . . . \r\n" );
document.write( "   Tony was 17-x, and his father was 50-x years old.\r\n" );
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document.write( "The condition says \r\n" );
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document.write( "4*(17 - x) = 50-x.\r\n" );
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document.write( "4*17 - 4x = 50 - x,\r\n" );
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document.write( "68 - 4x = 50 - x,\r\n" );
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document.write( "68 - 50 = 4x - x,\r\n" );
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document.write( "3x = 18,\r\n" );
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document.write( "x = 6.\r\n" );
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document.write( "Answer. It happened 6 years ago.\r\n" );
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document.write( "Check it yourself.\r\n" );
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