medium · GMAT Quant
An office has 100 computers. 60 have Software A, 50 have Software B, and 40 have Software C. 30 have A and B, 25 have B and C, and 20 have A and C, and every computer has at least one of the three programs.
How many computers have all three programs?
- 10
- 30
- 20
- 25
- 15
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