document.write( "Question 238907: A student averages 84 on five tests if the student recieved 84,82,81,and 79 on the first four exams what grade did the student recieve on the fifth exam? \n" ); document.write( "
Algebra.Com's Answer #175546 by unlockmath(1688) You can put this solution on YOUR website! Hello, \n" ); document.write( "To find the average of numbers, we need to add all the numbers and divide by 5. \n" ); document.write( "Since one of the numbers is unknown we'll represent by x so the equation will be: \n" ); document.write( "(84+82+81+79+x)/5 = 84 Combine like terms gives us: \n" ); document.write( "(326+x)/5 = 84 Multiply both sides by 5 \n" ); document.write( "326 + x = 420 Subtract both sides by 326 gives us: \n" ); document.write( "x = 94 There you go, he needs a 94 on the test to have an average of 84. \n" ); document.write( "RJ Toftness \n" ); document.write( "www.math-unlock.com \n" ); document.write( " |