Question

Suppose that 21 girls and 21 boys enter a mathemat- ics competition. furthermore, suppose that each entrant solves at most six questions, and for every boy-girl pair, there is at least one question that they both solved. show that there is a question that was solved by at least three girls and at least three boys.

Answer 1

Answer:

I think 18 is the answer.

Step-by-step explanation:

I hope that will be helpful dear. Please mark me as a brainliest.