Together, Bob, Colin and Dave weigh $$195\text{kg}$$. Bob weighs $$9\text{kg}$$ more than Colin and $$6\text{kg}$$ more than Dave. How much does Bob weigh? 
选项为:A:$$60\text{kg}$$  B:$$66\text{kg}$$  C:$$69\text{kg}$$  D:$$70\text{kg}$$  请回答其中一个选项.