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Mathematical problems can be used in Shantou Changsha.
Grasping the invariants, the boys here have not changed, and the boys are also considered as unit one.

The number of girls in the art group is 3/ 10, and there are 7 boys, of whom 3/7 are girls.

Later, five girls took part. At this time, girls in the art group accounted for two-fifths of the number of people in the art group. At this time, there are three boys, and the girls are two-thirds of the boys, with a difference of 2/3-3/7 = 5/2 1, corresponding to five people, and the boys are 5/5/2 1 = 265438+.

Now the number of people is 21× 2/3 =14+21= 35.