context: The acme of the horizontal engine was the Corliss steam engine, patented in 1849, which was a four-valve counter flow engine with separate steam admission and exhaust valves and automatic variable steam cutoff. When Corliss was given the Rumford medal the committee said that "no one invention since Watt's time has so enhanced the efficiency of the steam engine". In addition to using 30% less steam, it provided more uniform speed due to variable steam cut off, making it well suited to manufacturing, especially cotton spinning.
question: ওয়াট ইঞ্জিনের তুলনায় কোরলিস ইঞ্জিনে বাষ্প কত কম ব্যবহৃত হয়েছিল?
answers: 30% 30% less steam 30%