Watchman A has worked more night shifts in a row than Watchman B, who has worked five. Watchman C has worked fifteen night shifts in a row, more than Watchman A and Watchman B combined. Watchman D has worked eight night shifts in a row, less than Watchman A. How many night shifts in a row has Watchman A worked?

eight

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nine

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ten

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eleven

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Solution

The correct option is B
nine

Watchman A has worked more shifts in a row than Watchman D; therefore, Watchman A has worked more than eight shifts. The number of Watchman A's shifts plus the number of Watchman B's shifts (five) cannot equal fifteen or more, the number of Watchman C's shifts. Therefore, Watchman A has worked nine shifts in a row (5 + 9 = 14). Therefore, option (b) is the correct answer choice.

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