81 - 50 = 31
50 - 19 = 31
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50 subtracted by 34 = 16
39 is a composite number whose proper factors add up to 16.
It is: 23+29+31+37+41+43+47 = 251
3.020 as a mixed number is 31/50
Should be 50! Every odd integer is 1 less than the corresponding even integer and there are 50 of each in 100...