The number of chambers in an office is odd. Every chamber has fans and bulbs. The number of bulbs in each chamber is twice the number of fans in that chamber. The number of bulbs is the same in all the chambers. The total number of fans and bulbs in all the chambers is thirty. What is the total number of chambers in the office?

• A. 3
• B. 5
• C. 7
• D. 9