40
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80 as a percentage of 140 = 100*80/140 = 57.14%
60 - 140 = -80
The result of the equation - 100 plus 90 plus 60 plus 80, is found as follows; 100 + 90 + 60 + 80 = ( 100 + 90 ) + 60 + 80 = 190 + ( 60 + 80 ) = 190 + 140 = 330 Answer = 330
100, as it is the middle value of the numbers.
20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 220, . . .