document.write( "Question 924157: Please help me solve this question. The average of five numbers is 50. The average of four of the numbers is 40. What is the fifth number? \n" ); document.write( "

Algebra.Com's Answer #560651 by TimothyLamb(4379) $\"\"$ $\"About$

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x = sum of all 5 numbers
\n" ); document.write( "y = sum of first 4 numbers
\n" ); document.write( "---
\n" ); document.write( "x/5 = 50
\n" ); document.write( "y/4 = 40
\n" ); document.write( "---
\n" ); document.write( "x = 50*5
\n" ); document.write( "y = 40*4
\n" ); document.write( "---
\n" ); document.write( "x = 250
\n" ); document.write( "y = 160
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "5th number = x - y
\n" ); document.write( "5th number = 250 - 160
\n" ); document.write( "5th number = 90
\n" ); document.write( "---
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