document.write( "Question 1127911: The sum of the ages of Mr. lee and his son is 53 now. 4 years ago, the age of Mr. Lee was four times that of his son. Find their ages now. \n" ); document.write( "

Algebra.Com's Answer #744380 by ikleyn(52803) $\"\"$ $\"About$

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document.write( "(1)   L + S = 53      (\"The sum of the ages of Mr. lee and his son is 53 now\")\r\n" );
document.write( "(2)   L-4 = 4*(S-4)   (\"4 years ago, the age of Mr. Lee was four times that of his son\")\r\n" );
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document.write( "From equation (1), express  L = 53-S  and substitute it into equation (2). You will get\r\n" );
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document.write( "(53-S) - 4 = 4*(S-4)\r\n" );
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document.write( "49 - S = 4S - 16\r\n" );
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document.write( "49 + 16 = 4S + S\r\n" );
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document.write( "65 = 5S  ====>  S = 65/5 = 13.\r\n" );
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document.write( "Answer.  The sun is 13 years old.  The father (= Mr. Lee) is 53-13 = 40 years old.\r\n" );
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