According to the number of math group is 65438+ 0/2 of the other two groups, there is an equation:
3X+3=(4X+3X)× 1/2
3X+3=7X/2
7X/2-3X=3
X/2=3
X=3×2
X=6
4X=4×6=24
3X=3×6= 18
3X+3=3×6+3=2 1
A: There are 24 people in the art group, model airplane group 18 and math group 2 1.