Answer:
33 students
If you divided the class into groups with 4 boys and 7 girls in each group, there will be 11 students in each group.
The total number of students in the class therefore must be a multiple of 11.
The only multiple of 11 between 24 and 40 is 33.
There are therefore 33 students.
4/11×33=12 are boys and 7/11×33=21are girls.
12:21= 4:7
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