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.## Management Sciences

A. 12

B. 13

C. 11

**D. 10**

Explanation:

Part of the filled by all the three pipes in one minute

= 1/18 + 1/15 – 1/45 = (5 + 6 – 2)/90 = 9/90 = 1/10

So, the tank becomes full in 10 minutes.

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