The answer is 4.8. 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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13 + 16 + 18 + 20 + 21 + 26 + 27 + 27 + 28 + 36 + 39 + 42 + 43 = 356
228
122 !
It is: 3+(21/7*8) = 27
21