Answer: 1. Out of 24 people, 7 were not wear jeans and sneakers
2. Out of 24 people only 12 were wearing both jeans and sneakers
3. Out of 24 people only 2 were wearing jeans only and 12 were wearing both jeans and sneakers. This means that there were 14 people in total who where either wearing jeans only, or both jeans and sneakers.
4. Out of 24 people, 2 were wearing jeans only and 3 only had sneakers on. So this means that only 5 people who are not wearing both sneakers and jeans at the same.