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D=M/V D is density. M is mass. V is volume. Therefore, density is mass per unit volume.
L=50 c=100 d=500 m=1000
The D stands for 500. It goes I, V, X, L, C, D and then M.
M = 1000, CD = 400 and XL = 40, so 1440 would be written as MCDXL.
Presumably you mean in Roman numerals in which case they stand for 1000, 500 and 100 respectively.