At a certain restaurant, the ratio of the number of cooks to the number of waiters is 3 to 10. 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?	Choose the correct choice:
A) 4
B) 6
C) 9
D) 12
E) 15
Originally there were 3k cooks and 10k waiters.   14k = 10k+12   k=3   There are 9 cooks.   The answer is 9.
<result>C</result>
At a certain restaurant, the ratio of the number of cooks to the number of waiters is 3 to 10. 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?