can someone please explain this?

An elevator says the maximum capacity is 900 kg. Eleven people are already on the elevator, their weight totaling 2000 lb. Another man who weighs 270 1b wants to get on. Should they let him onto the elevator? Round your answer to at least 1 decimal place, if necessary. lelelalelmw If the other man were to get on the elevator, the total weight on it would be [:1 kg