This year we have to make our school assignments in pairs.
With each classmate must be made exactly one of those assignments.
Exactly 30% of the assignments will be made by a pair of girls.
How many assignments do I have to make?
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I'm not sure if this is the only possible solution to the puzzle, but I found that if:
You have 2 boys and 3 girls in the class, then 10 total assignments will be made where 3 are made by solely girls. This means that you have to make four assignments in total.
Again, there may be more solutions based on the rules outlined in the puzzle.