Nil 
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? 
Options:
  $$60\text{kg}$$ 
  $$66\text{kg}$$ 
  $$69\text{kg}$$ 
  $$70\text{kg}$$ 