At a certain restaurant, the ratio of the number of cooks to the number of waiters is 3 to 11. When 12 more waiters are hired, the ratio of the number of cooks to the number of waiters changes to 3 to 14. How many cooks does the restaurant have?  Select the correct option.
A) 4  B) 6  C) 9  D) 12  E) 15
Originally there were 3k cooks and 11k waiters.   14k = 11k+12   k=4   There are 12 cooks.   The answer is 12.
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At a certain restaurant, the ratio of the number of cooks to the number of waiters is 3 to 11. When 12 more waiters are hired, the ratio of the number of cooks to the number of waiters changes to 3 to 14. How many cooks does the restaurant have?