Question

Q . In a party, each boy dances with exactly three girls, and each girl dances with exactly four boys. If a total of 35 students are present at the party, how many boys are
there?

please let me know the answer ​

Answer 1

Answer:

Therefore, the 3 groups can be chosen 84 x 20 x 1 = 1680 ways. However, since the order of the 3 groups doesn't matter, we have to divide 1680 by 3!. Hence, the number of ways 9 people can be divided into 3 groups is 1680/3! = 1680/6 = 280.

Answer 2

Answer:

there are 4 boys

Step-by-step explanation:

duh.. I don't know the real answer