If the number of math teams is x, the total number is 3x.

The number of the model airplane team is x-3.

Number of meteorological team: (4/3)*(x-3)

x+x-3+(4/3)*(x-3)=3x

The solution is x=2 1.

x-3=2 1-3= 18

(4/3)*(x-3)=(4/3)*(2 1-3)= 24

Answer: Math 2 1, model airplane 18, meteorology 24.