Current location - Training Enrollment Network - Mathematics courses - M-girls, a senior high school math problem A, B, C and D, participated in a trio performance at the concert.
M-girls, a senior high school math problem A, B, C and D, participated in a trio performance at the concert.
The number of songs in B and C is 5 or 6.

So the sum of the singing numbers of B and C is 10, 1 1 or 12.

Three people sing at a time.

So the total number of songs is a multiple of 3.

So the sum of b and c can only be 10.

So the total amount =7+4+ 10=2 1.

2 1÷3=7

So the number of trio is 7.