设乙班是x人,甲班为84-x人,
5
8 ×(84-x)+
3
4 x=58,
52.5-
5
8 x+
3
4 x=58,
52.5+
1
8 x=58,
52.5+
1
8 x-52.5=58-52.5,
1
8 x=5.5,
1
8 x÷
1
8 =5.5÷
1
8
x=44;
甲班:84-44=40人;
答:甲班有40人,乙班有44人.
故答案为:40,44.
设乙班是x人,甲班为84-x人,
5
8 ×(84-x)+
3
4 x=58,
52.5-
5
8 x+
3
4 x=58,
52.5+
1
8 x=58,
52.5+
1
8 x-52.5=58-52.5,
1
8 x=5.5,
1
8 x÷
1
8 =5.5÷
1
8
x=44;
甲班:84-44=40人;
答:甲班有40人,乙班有44人.
故答案为:40,44.