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Eight math problems and multiple solutions to one problem
5/8 is all 6 baskets, so 3/8 is all 3/5 of 6 baskets, that is, 6× 3/5 = 18/5 baskets = 3 and 3/5 baskets.

So the weight of 3/5 baskets is 24 kg, so a basket is 24 ÷ 3/5 = 40 kg.

So the total weight of 3/8 is: 18/5× 40 = 144 kg.

Weight of all tomatoes: 144 ÷ 3/8 = 384kg.

The number of students in Class A and Class B is 84× 3/4 = 63.

The number of 5/8 of Class A and 3/4 of Class B is ***58, with a difference of 63-58 = 5, which is caused by 5/8 of Class A and 3/4 of Class A, so the number of Class A is: 5 ÷ (3/4-5/8) = 40.

So the number of students in Class B: 84-40 = 44.