medium · GMAT Quant
Quarry Labs tracks 39 crates: 14 have X, 13 have Y, and 12 have Z. 7 crates have exactly two of the three marks and 1 have all three. An unused fourth mark is listed in the legend.
How many crates have exactly one mark?
- 7
- 10
- 1
- 39
- 22
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