The number is 84.
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There is a lot of answer for this, but I tell you one. The answer is 6541.
12
46
415
The number is 84.Assign the digits in the number the letters a and b.GIVEN: a + b = 12GIVEN: a = 2bSolve for b, then solve for a.2b + b = 123b = 12b = 4a = 2(4) = 8