Hua has been smart and studious since childhood. When I was in junior high school, one day Mr. Wang Weike gave the whole class a math problem, which was calculated from the Art of War by Sun Tzu: "At present, there are unknown things, 3322, 5523 and 7722. What is the geometry of things? " . After reading the topic, Mr. Wang glanced at the whole class. A student stood up and said, "There are 23 items." The first student to tell the answer is young Hua. When solving this problem, Hua thinks like this: starting from "the number of seven plus seven gets two", that is to say, seven gets two, then the multiple of seven plus two is this number, and this number is 7 × 3+2 = 23.