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40. (X=10, L=50. A 1 or 10-multiple letter placed BEFORE a larger number subtracts from it. This applies only to the next two larger numbers, a 5-value and a 10-value.) XL = 40, L = 50, XC = 90, C =100 (but not IC, VC, or LC)
40. When a larger number is preceded by a smaller, the smaller is subtracted from the larger. Since L, which is 50, is preceded by X, which is 10, the answer is 50-10=40.

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