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The sum of the equation - 990 + 880 +90 +790 +690 + 40, is found as follows;990 + 880 +90 +790 +690 + 40= (990 + 880) + (90 +790) + (690 + 40)= ( 1870 ) + (880 ) + ( 730 )= 3480Answer = 3480
60 + 60 + 60 + 50 + 50 + 40 + 30 = 350
50
10 plus 20 plus 30plus 40 plus 50 equals 150 because 50 plus 40 equals 90 plus 30 =120+20= 140 then + 10 = 150
40% of 80 is 32%..40% of 80= 40% * 80= 0.4 * 80= 32