【Known, school belle Lin Xiaoqing can lift 80 kilograms of weight, ask what is the arm strength of Lin Xiaoqing?】 Answer: Left arm 49 jin, right arm 67 jin. 【Known, one plus one equals two, ask what is the result of 491 multiplied by 709?】 Answer: 348119. Other people's logic is deduction; my logic is causality. When a difficult problem is raised, the answer is already obvious. Process? Sorry, only the result matters!