26 students 15 like vanilla 16 like chocolate. 3 do not like either flavour. How many like both vanilla and chocolate
Define our people:
Total = Vanilla Only + Chocolate Only - Vanilla and Chocolate + Neither
26 = 15 + 16 - V&C + 3
26 = 34 - V&C
Subtract 34 from each side
-V&C = -8
Multiply each side by -1
V&C = 8
Define our people:
- We have Vanilla Only
- Chocolate Only
- Both Vanilla and Chocolate
- Neither Vanilla Nor Chocolate
- Add up 1-4 to get our total
Total = Vanilla Only + Chocolate Only - Vanilla and Chocolate + Neither
26 = 15 + 16 - V&C + 3
26 = 34 - V&C
Subtract 34 from each side
-V&C = -8
Multiply each side by -1
V&C = 8