So the average weight of all students is equal to the average weight of two boys and one girl =(4 1*2+35)/3=39.

Sum of four numbers = 14*4=56

The sum of three large numbers is 15*3=45, and the decimal is 56-45 = 1 1.

The sum of three decimal places is 38, and the large number =56-38= 18.

So the sum of the middle two numbers =45+38-56=27.

The second largest number is odd, and the middle two numbers are >; 1 1 and

So 27 can only be divided into 15+ 12, and the second largest odd number is 15.

The average is 120/6=20, which is a continuous odd number, so 15, 17,19,2123,25.

(38*50-55-69)/(50-2)=37

The first four digits and the last four digits are only repeated once by the fourth digit.

Therefore, the fourth number =30*4+60*4-49*7= 17.