The ratio between the thirsty Kubus and the water he drank: $$(100-85):(85-84)=15:1$$.  So, the weight of the thirsty Kubus is: $$800 \times \frac{15}{15+1}=750$$ kg. 
Water makes up $$84\textbackslash\%$$ of the weight of Kubus the Camel when he is thirsty. After he drinks, Kubus weighs $$800$$ kg and water makes up $$85\textbackslash\%$$ of his weight. What is the weight of Kubus the Camel when he is thirsty? ($$2001$$ Math Kangaroo Problem, Level $$9-10$$, Question \#$$16$$) 
* $$672$$ kg 
* $$680$$ kg 
* $$715$$ kg 
* $$720$$ kg 
* $$750$$ kg 