2 1 5 6
60
1, when the smallest two are 18, the other is 33.
2. Four classes have a ***48+49+45+44 people, plus the transferred 14 people and a ***200 people, with an average of 50 people in each class, so each class is transferred to 2 1, 5,6 people respectively.
3. Suppose A, B, C and D are ABCD.
build
B+C+D=45*3= 135
A+C+D=60*3= 180
A+B+D=65*3= 195
A+B+C=70*3=2 10
The sum of the four formulas is 3A+3B+3C+3D=720, that is, A+B+C+D=240, so the average value of a, b, c and d is 60.