A survey of 121 persons was conducted at school, and it was found that 48 people carried a cell phone, 43 people carried a tablet computer, and 20 carried both a cell phone and a tablet.
1. How many people carried a cell phone or a tablet?
2. How many people carried neither a cell phone nor a tablet?
3. How many people carried a cell phone only?
4. How many people carried a tablet but not a cell phone?
My answers but my homework website said I was wrong....
1. 91 , 2. 10 , 3. 48 , 4. 43