i would say count up
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50
rearrange 1 to 50 so that you see this pattern: 50 = 50 1+49 = 50 2+48 = 50 ... 24+26 = 50 25 = 25 then add this up: 25 x 50 + 25 = 1275
50*51/2 = 1275
A compatible number is a number that is easy to add when you add it together.
You could add a hole to the 50 pound barrel full of oil and drain out some of the oil to make it less than 50 pounds.