document.write( "Question 538086: Josh has scored 65, 71, and 91 on his last three tests. what score must he get on his next exam to have an average (mean) of 80? \n" ); document.write( "
Algebra.Com's Answer #353103 by Gurukool(2)![]() ![]() ![]() You can put this solution on YOUR website! Assume he has to score X in the next exam.\r \n" ); document.write( "\n" ); document.write( "Then (65 + 71 + 91 + X)/4 = 80\r \n" ); document.write( "\n" ); document.write( "=> X = 80*4 - (65 + 71 + 91)\r \n" ); document.write( "\n" ); document.write( "=> X = 93\r \n" ); document.write( "\n" ); document.write( "So Josh has to score 93 in the next exam to have an average of 80. \n" ); document.write( " |