There are 72 students in the school, and the calligraphy group is six times less than the chorus group. How many students are there in the calligraphy group?

The number of people in the calligraphy group is three times less than that in the chorus group, that is to say, the calligraphy group +6= four times that of the chorus group and the calligraphy group+chorus group =72, so 72+6=78 is four times that of the chorus group, that is, 39/2 * 3-6 = 105/.