I'll give you a question, please answer with step-by-step reasoning process.
a contract was signed to complete a job in 30 days. after how many days can 5 men leave then so that the job can be completed in 35 days\nOptions:\n(A) 30 days.\n(B) 35 days.\n(C) 45 days.\n(D) 55 days.\n(E) 65 days.

(B)
If no of men used initially is x, then after (35-x) days 5 men can leave so that the job can be completed in 35 days.

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So, the final answer is (B)