Science and technology group: composition group =2:3=8: 12.
Composition group: Math group =4:5= 12: 15.
A ***70 people
Because the proportion of the other group is unknown, by inference
1: there are 8 people in science and technology group, 0/2 people in composition group, 0/5 people in mathematics group and 35 people in reasoning group.
2. Science and Technology Group 16 Composition Group 24 Mathematics Group 30 Mystery Group 0 (not established)
So the answer is 1: 8 people in the science and technology group, 12 people in the composition group, 15 people in the mathematics group and 35 people in the reasoning group.