Exam Maths Puzzle Blood Relations

My quota is 3000 cases and last year I sold 1887 cases what percentage of increase is 3000 cases?

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Exam Other Question

Afreight train and an express train leave towns 390km apart, traveling toward one another. The freight train travels 30km per hr slower than the express train. They pass another 3 hr. later. What are their speeds! How do I check the solution for 7m+8=71