Free GMAT Practice Question

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ID: GMAT-QR-PS-041
Section: Quantitative Reasoning - Problem Solving (PS)
Topic: Maximum & Minimum value
Difficulty level: Hard

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A courier service handled exactly 60 parcels in one day. Each parcel was charged at exactly one of three rates: 5 dollars, 8 dollars, or 12 dollars. The service collected exactly 500 dollars for the 60 parcels, and at least one parcel was charged at each of the three rates. The least and the greatest possible numbers of parcels charged at 12 dollars are, respectively,

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