Quantitative Aptitude :: Problems on Numbers - Discussion

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Explanation:
Let's number is N
so N = DX + 8 -------(1)
N = 3DY + 21 ---------(2)

From Eq. 1 & 2
=> D(X-3Y) = 13
"13" is prime number, and its factors will be 1 and 13 only
=> X-3Y must be 1
Let X = 4 and Y = 1, D=13
So, N = 60
Remainder Left = 2N / 3D
= 120 / 39 = 3