Free GMAT Practice Question

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ID: GMAT-QR-PS-047
Section: Quantitative Reasoning - Problem Solving (PS)
Topic: Average
Difficulty level: Hard

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A distributor shipped three lots of crates. The $15$ crates in the first lot had an average (arithmetic mean) weight of $30$ kilograms, and the $30$ crates in the second lot had an average weight of $36$ kilograms. Every crate in the third lot weighed exactly $48$ kilograms. If the average weight of all the crates in the three lots was $8$ kilograms greater than the average weight of the crates in the first two lots, how many crates were in the third lot?

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