50 + 50 + 50 + 90 = 240
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1 100 + 50 + 90 + 45 _____ 285
The sum of the equation - 990 + 880 +90 +790 +690 + 50, is found as follows;990 + 880 +90 +790 +690 + 50= (990 + 880) + (90 +790) + (690 + 50)= ( 1870 ) + (880 ) + ( 740 )= 3490Answer = 3490
90
The answer of 17 + 123 is 140 and then minus 50 is 90
-90 (when you add a negative you simply subtract so -40-50 is -90)