Explanation:
The first job here is to realize that the efficiency of the absorption refrigeration cycle is expressed by (1-To/Tg) (Te/(To-Te)), where o indicates environment, e indicates evaporator (the coolest temperature), and g indicates generator ( the highest temperature). Then,you only need to convert the given temperatures to absolute temperatures and plug in the above expression. You do not need to memorize this expression; it can be derived readily. One tip to keep in mind when working on such problems is that if you must divide or multiply temperatures, then they probably should be in absolute terms.
