The answer is 5020. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
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20 = 400
Yes.
205
A equals 20.
10 plus 20 plus 30plus 40 plus 50 equals 150 because 50 plus 40 equals 90 plus 30 =120+20= 140 then + 10 = 150