An object with mass $10\,\text{kg}$ keeps five identical bags of rice in balance on a uniform beam. Two additional bags, each identical to the first five, are then placed with them. The mean position of the bags on the beam stays the same. What mass is required now to balance the bags?
- A$3.5\,\text{kg}$
- B$7.0\,\text{kg}$
- C$12\,\text{kg}$
- D$14\,\text{kg}$