document.write( "Question 1197150: The average of four numbers is 67. If three of these numbers are 56, 87, and 72, what is the fourth number? \n" ); document.write( "

Algebra.Com's Answer #830278 by MathLover1(20850) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( "let the fourth number be $\"x\"$ \r
\n" ); document.write( "\n" ); document.write( "if the average of four numbers is $\"67\"$ , and if three of these numbers are $\"56\"$ , $\"87\"$ , and $\"72\"$ , we have\r
\n" ); document.write( "\n" ); document.write( " $\"%28x%2B56%2B87%2B72%29%2F4=67\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"%28x%2B215%29=67%2A4\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x%2B215=268\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x=268-215\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"x=53\"$ \r
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\n" ); document.write( "\n" ); document.write( "answer: the fourth number is $\"53\"$ \r
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