Free GMAT Practice Question

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ID: GMAT-QR-PS-032
Section: GMAT Quantitative Reasoning - Problem Solving (PS)
Topic: Set
Difficulty level: Hard

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At a certain training centre the ratio of trainees to supervisors is 5 to 2. If 20 trainees join the centre and 4 supervisors leave it, the ratio of trainees to supervisors will be 3 to 1. How many trainees will the centre have after those changes?

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