There are 120 students in the sixth grade of the experimental primary school, which is equivalent to 5 / 6 of the number of students in the fifth grade. The number of students in the two grades accounts for 2 / 5 of the total number of students in the school How many students are there in the school= Any formula or equation is OK,

(120 △ 5 / 6 + 120) △ 2 / 5 = 660 persons

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