1. Out of 25 teachers, 16 are married and 15 are women. If 6 of the men are married how many women are not married? 2. Find in terms of π, the curved surface of a cone with circular base diameter 10cm and height 12cm.
3. A and B contribute $140,000 and $180,000 respectively in a business partnership. Of the profit, A receives 20% as manager and the rest is shared in the ratio of their capitals. What is the ratio of A's total share of the profit to B's?