89. A, B, C, D four classes have fewer than 50 people each, on average 46 people, A and B classes differ by 4 people, B and C classes differ by 3 people, C and D classes differ by 2 people, A class has the most people, A class has $\qquad$ people,

B class has $\qquad$ people, C class has $\qquad$ people, D class has $\qquad$ people.
48 ; 44 ; 47 ; 45