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2022年8月14日 #

MathProblem 29 Four dogs and a square problem

摘要： Four dogs occupy the four corners of a square with side of length a. At the same time each dog starts walking at the same speed directly toward the do 阅读全文

posted @ 2022-08-14 06:16 Blackzxy 阅读(29) 评论(0) 推荐(0) 编辑

MathProblem 28 Furniture factory problem

摘要： A factory that produces tables and chairs is equipped with 10 saws, 6 lathes, and 18 sanding machines. It takes a chair 10 minutes on a saw, 5 minutes 阅读全文

posted @ 2022-08-14 03:50 Blackzxy 阅读(14) 评论(0) 推荐(0) 编辑