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KC
17 tháng 3 2016
10 studens :
5-3=2 parts
1 part
10:2=5 studens
that class has
5x9=45 studens
answer:45 studens
LD
20 tháng 7 2017
because the ratio of the number of girls to the number of boys in my a classroom , was 5:4 => the ratio of the number of boys to the number of student in my classroom was 4 : 9
When 10 remained girls left the classroom ,the ratio of the number boys of to the number of girls became 4:3 => the ratio of the number of boys to the number of student in my classroom ( after 10 remained girls left) was 4 : 7
=> the number of student in my classroom at first were 10 : ( 9 - 7 ) x 9 = 45 ( students )
so the answer is 45 students