medium · GMAT Quant
In a survey of 200 households regarding their electronic devices, 120 had a TV, 90 had a computer, and 70 had a smartphone. Of these, 40 households had both a TV and a computer, 30 had both a TV and a smartphone, and 25 had both a computer and a smartphone, while 15 households had all three devices.
How many households had none of these devices?
- 30
- 15
- 10
- 20
- 0
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