390
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The result of the equation - 70 plus 90 plus 60 plus 80, is found as follows; 70 + 90 + 60 + 80 = ( 70 + 90 ) + 60 + 80 = 160 + ( 60 + 80 ) = 160 + 140 = 300 Answer = 300
The result of the equation - 80 plus 90 plus 60 plus 80, is found as follows; 80 + 90 + 60 + 80 = ( 80 + 90 ) + 60 + 80 = 170 + ( 60 + 80 ) = 170 + 140 = 310 Answer = 310
The average is 80.
The result of the equation - 60 plus 90 plus 60 plus 80, is found as follows; 60 + 90 + 60 + 80 = ( 60 + 90 ) + 60 + 80 = 150 + ( 60 + 80 ) = 150 + 140 = 290 Answer = 290
The result of the equation - 120 plus 90 plus 60 plus 80, is found as follows; 120 + 90 + 60 + 80 = ( 120 + 90 ) + 60 + 80 = 210 + ( 60 + 80 ) = 210 + 140 = 350 Answer = 350