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【题目】实验小学一、二、三年级共有267人,一年级与二年级的人数比是7∶6,二年级与三年级的人数比是5∶4,这三个年级各有多少人?【分析与解】这道题已知一、二、三年级共有267人,但并不知道三个年级的总份数,只知道一年级与二年级的人数比是7∶6,二年级与三年级的人数比是5∶4,如果能将题中的两个比转化成连比,从而知道三个年级的总份数,就能轻松地把题目解答出来。
【Subject】 Experimental primary school has a total of 267 people in first, second and third grade. The ratio of first grade to second grade is 7: 6, and the ratio of second grade to third grade is 5: 4. How many of these three grades are there? 【Analysis and Settlement】 This question is known to have a total of 267 students in the first, second and third years. However, we do not know the total number of the three grades. We only know that the ratio between the first grade and the second grade is 7: 6, The ratio of the third grade is 5: 4. If we can convert the two ratios of the questions into a ratio, so that we can know the total number of the three grades, we can easily answer the questions.