The mathematical statement 31 plus 21 equals 52 as a total.
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The statement 10 plus 21 equals 31 in total. It can also be written as 10 + 21 = 31.
7x + 5y 7(3) + 5(2) 21 + 10 = 31
31
8 + 31 = 39
55 + 34 + 31 + 27 + 21 + 21 + 20 + 17 + 15 + 15 = 256