题目

F. Scott Fitzgerald, born on September 24, 1896, an American novelist, was once a student of St. Paul Academy, the Newman School and attended Princeton University for a short while. In 1917 he joined the army and was posted in Alabama, where he met his future wife Zelda Sayre. Then he had to make some money to impress her. His life with her was full of great happiness, as he wrote in his diary: “My own happiness in the past often approached such joy that I could not share it even with the person dearest to me but had to walk it away in quiet streets and take down parts of it in my dia一、二两个生产小组共有37名工人，如果一组人数增加本组的13，二组人数减少2人，则两组人数相等．两组人数相差多少人？