Class two and class three are 1 1: 13, so class two is13/24-1/24 = 2/24 =1/kloc.

At this time, the total number of class 2 and class 3 is regarded as "unit 1", and the total number of people = difference ÷ difference rate, that is, 8 ÷112 = 96 people.

Class one accounts for 1/3 of the total, that is, class two and class three account for 2/3 of the total, and the total number of people = 96 ÷ (1-1/3) =144.