A workshop can make 500 class a parts or 250 class B parts every day, and each class A and class B parts will form a set of products. Now, if we want to make the most complete set of products within 30 days, how many days should each class A and class B parts be made?

If class a parts should be made in X days, then class B parts should be made in (30-x) days. According to the meaning of the question, 500X = 250 (30-x), the solution is x = 10 (days), 30-x = 30-10 = 20 (days). Answer: class a parts should be made in 10 days, and class B parts should be made in 20 days

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