document.write( "Question 1161882: 33 of the students in a class play either football or table tennis. If 22 students play football and 18 play table tennis, how many students play football only
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Algebra.Com's Answer #785535 by Edwin McCravy(20054) $\"\"$ $\"About$

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\n" ); document.write( "33 of the students in a class play either football or table tennis.

Let x = the number who play football but don't play table tennis.\r\n" );
document.write( "Let y = the number who play football and also play table tennis.\r\n" );
document.write( "Let z = the number who play table tennis but do not play football.\r\n" );
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document.write( "x + y + z = 33

If 22 students play football

x + y = 22

and 18 play table tennis,

y + z = 18\r\n" );
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document.write( "Subtract the third equation from the first:\r\n" );
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document.write( "x + y + z = 33\r\n" );
document.write( "    y + z = 18\r\n" );
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document.write( "x         = 15\r\n" );
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document.write( "how many students play football only.\r\n" );
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document.write( "Answer = 15.\r\n" );
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document.write( "Edwin

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