Answer:
5. How many people were surveyed?
Ans: 47
Sol: 10+15+8+2+4+5+3 = 47
6. How many buy samsung and huawei?
Ans: 5 (as seen on the diagram)
7. How many buy both huawei and nokia but not samsung?
Ans: 3 (as seen on the diagram)
8. How many buy huawei or nokia but not samsung?
Ans: 23
Sol: 8 + 15 = 23
9. How many buy samsung or huawei?
Ans: 25
Sol: 10+15 = 25
10. How many buy Nokia, Samsung, and Huawei?
Ans: 4 (as seen on the diagram)
