看了贵刊1995年第10期刊登的《运用矩形图巧解“牛吃草”问题》读后颇受教益,掩卷之余,我觉得”牛吃草”问题若用假设法来想,则更为巧妙、简洁,提出来供大家参考。原题:牧场上长满牧草,每天以均匀速度生长,这片牧场上的草可供10头牛吃20天,可供15头牛吃10天,问可供25头牛吃多少天? Read your magazine published in 1995 No. 10, “the use of rectangular map clever solution” Cattle grazing “After reading quite popular teaching, concealment, I think” bull grazing "problem if you want to use hypotheses, It is more ingenious, concise, put forward for your reference. Original title: Pastures covered with pasture, growing at a uniform rate every day, this piece of pasture grass for 10 cows to eat 20 days for 15 cows eat 10 days, ask for 25 cows eat for how many days?