^^^E: Referring to previously made post about 792kg being the answer.
No this is not correct.
This would mean that 1% of 800kg is the same as 1% of weight before, which can not be true. Also it means that the camel consists of 100% water. A % change of water content does not mean the same % change of total mass. These two things might be hard to understand, but there is no need to rephrase this question and your answer is not correct.
You might find a drastic weight change of 50kg (from 750-800) quite hard to believe, but after doing some research like I did you will find that camels can drink A LOT of water in one go in order to survive in the desert for weeks without water!
http://www.loc.gov/rr/scitech/mysteries/camel.html
'They drink large amounts of water - up to 20 gallons at a time. This water is stored in the animal's bloodstream.'
20 gallons converts to 91 litres to the nearest litre!
Of course litres and kg are not one and the same thing, but 1 litre of water is in fact roughly 1 kg!
http://en.wikipedia.org/wiki/Litre
'From 1901 to 1964, the litre was defined as the volume of one kilogram of pure water at 4 °C and 760 millimetres of mercury pressure.'
So yes, a change of 50kg is feasible. There is no need to change the question around as apart from a few assumptions...
1.Non-H2O mass of camel is constant throughout
2.No mass is lost through excretion
...and a few others I can't think of right now the question is perfectly fine!
As crazy as this might seem - the camel gained 50kg in weight.