Free GMAT Practice Question

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ID: GMAT-QR-PS-075
Section: Quantitative Reasoning - Problem Solving (PS)
Topic: Average
Difficulty level: Medium

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A workshop makes a single kind of item. On Monday it made $30$ items at a mean cost of $18$ dollars per item. On Tuesday it made a further batch of the same item at a mean cost of $24$ dollars per item. Taking the two days together, the mean cost of all the items made was $21.60$ dollars per item. How many items did the workshop make on Tuesday?

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