document.write( "Question 460393: The average of 5 numbers is 48.The average of the first 3 numbers is 30. The forth number is 20 more then the fifth number. What is the fourth number. \n" ); document.write( "
Algebra.Com's Answer #315776 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! The average of 5 numbers is 48.The average of the first 3 numbers is 30. \n" ); document.write( " The fourth number is 20 more then the fifth number. \n" ); document.write( " What is the fourth number. \n" ); document.write( ": \n" ); document.write( "\"The average of 5 numbers is 48\" \n" ); document.write( " \n" ); document.write( "a + b + c + d + e = 5(48) \n" ); document.write( "a + b + c + d + e = 240 \n" ); document.write( ": \n" ); document.write( "\"The average of the first 3 numbers is 30.\" \n" ); document.write( " \n" ); document.write( "a + b + c = 90 \n" ); document.write( ": \n" ); document.write( "\"The fourth number is 20 more then the fifth number.\" \n" ); document.write( "d = (e+20) \n" ); document.write( "e = (d-20) \n" ); document.write( ": \n" ); document.write( "In the 1st equation replace a+b+c with 90, replace e with (d-20) \n" ); document.write( "90 + d + (d-20) = 240 \n" ); document.write( "2d = 240 - 70 \n" ); document.write( "2d = 170 \n" ); document.write( "d = \n" ); document.write( "d = 85 is the 4th number \n" ); document.write( " \n" ); document.write( " |