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There are 360 students in grade 4.5.6 of Guangming primary school, five times, each of the three grades
According to the proportion of the three grades 1:1.5:2, the sum of the proportion is 1 + 1.5 + 2 = 4.5
Number of students in grade 4: 360 * 1 / 4.5 = 80
Number of students in Grade 5: 360 * 1.5 / 4.5 = 120
Number of students in Grade 6: 360 * 2 / 4.5 = 160 or 360-80-120 = 160
A: there are 80 students in grade 4, 120 students in Grade 5 and 160 students in Grade 6 of Guangming primary school
There are 360 students in Grade 6, and the number of girls is one fourth more than that of boys,
x+（1+1/4）x=360
There are 220 students in Grade 6 of Guangming primary school
220 △ 1.1 = 200 (person)
A: there are 200 students in grade four
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