420.
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The result of the equation - 50 plus 90 plus 60 plus 80, is found as follows; 50 + 90 + 60 + 80 = ( 50 + 90 ) + 60 + 80 = 140 + ( 60 + 80 ) = 140 + 140 = 280 Answer = 280
140 and the half of 140 is 90 the half of 90 is 45 the half of 45 is 22.5 the half of that is 10.5.2
700
840
280 divided by 2