38 + 47 = 85
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Sum = 38 + M
Subtract the difference and half your answer, giving 9 which is the smaller number, add the difference to this and you get 38 which is the larger number.
171 - 38 = 133 so 133 + 38 sum to 171
Sum of interior angles of a 38 sided polygon: (38-2)*180 = 6480 degrees
The sum of -47 and -25 is -72.