Venn Diagram Worksheet for Maths Olympiad

Maths Olympiad topic 32: Venn diagrams and inclusion–exclusion · Set 62 · 40 questions

How to solve it (Do not count twice): n(A or B) = n(A) + n(B) − n(both) — otherwise the “both” group is counted twice. Only A = n(A) − n(both). Neither = total − n(A or B). Both = n(A) + n(B) − n(A or B).

1. 1.In a class of 40 children, 15 like dance, 25 like music and 5 like both. How many like only dance? (a) 20 (b) 15 (c) 10 (d) 5
2. 2.In a class of 29 children, 15 like cricket, 10 like football and 2 like both. How many like only cricket? (a) 19 (b) 15 (c) 13 (d) 8
3. 3.In a class of 32 children, 17 like dance, 14 like music and 7 like both. How many like only dance? (a) 7 (b) 17 (c) 18 (d) 10
4. 4.In a class of 31 children, 7 like maths, 19 like science and 2 like both. How many like only maths? (a) 7 (b) 12 (c) 17 (d) 5
5. 5.In a class of 28 children, 18 like tea, 11 like coffee and 4 like both. How many like at least one of the two? (a) 28 (b) 29 (c) 21 (d) 25
6. 6.In a class of 37 children, 18 like dance, 26 like music and 11 like both. How many like only dance? (a) 18 (b) 7 (c) 15 (d) 11
7. 7.In a class of 38 children, 24 like dance, 11 like music and 4 like both. How many like at least one of the two? (a) 27 (b) 35 (c) 38 (d) 31
8. 8.In a class of 41 children, 22 like maths, 19 like science and 8 like both. How many like only maths? (a) 22 (b) 11 (c) 14 (d) 8
9. 9.In a class of 17 children, 8 like mangoes, 8 like bananas and 6 like neither. How many like both? (a) 4 (b) 5 (c) 11 (d) 6
10. 10.In a class of 39 children, 25 like cricket, 21 like football and 8 like both. How many like neither? (a) 8 (b) 1 (c) 9 (d) 2
11. 11.In a class of 39 children, 28 like cricket, 15 like football and 11 like both. How many like only cricket? (a) 28 (b) 4 (c) 24 (d) 17
12. 12.In a class of 42 children, 24 like mangoes, 26 like bananas and 10 like both. How many like at least one of the two? (a) 50 (b) 42 (c) 40 (d) 30
13. 13.In a class of 27 children, 12 like mangoes, 14 like bananas and 9 like both. How many like at least one of the two? (a) 17 (b) 8 (c) 26 (d) 27
14. 14.In a class of 15 children, 6 like mangoes, 8 like bananas and 3 like both. How many like neither? (a) 3 (b) 4 (c) 7 (d) 1
15. 15.In a class of 31 children, 13 like cricket, 16 like football and 2 like both. How many like only cricket? (a) 14 (b) 13 (c) 15 (d) 11
16. 16.In a class of 35 children, 12 like tea, 18 like coffee and 10 like neither. How many like both? (a) 25 (b) 10 (c) 6 (d) 5
17. 17.In a class of 38 children, 16 like mangoes, 21 like bananas and 4 like both. How many like neither? (a) 4 (b) 1 (c) 9 (d) 5
18. 18.In a class of 41 children, 24 like mangoes, 21 like bananas and 9 like both. How many like only mangoes? (a) 12 (b) 24 (c) 20 (d) 15
19. 19.In a class of 23 children, 7 like cricket, 14 like football and 4 like both. How many like only cricket? (a) 3 (b) 9 (c) 10 (d) 7
20. 20.In a class of 26 children, 19 like dance, 16 like music and 11 like both. How many like only dance? (a) 5 (b) 8 (c) 10 (d) 19
21. 21.In a class of 41 children, 19 like tea, 21 like coffee and 5 like both. How many like only tea? (a) 16 (b) 20 (c) 14 (d) 19
22. 22.In a class of 40 children, 27 like cricket, 12 like football and 9 like both. How many like neither? (a) 1 (b) 9 (c) 19 (d) 10
23. 23.In a class of 37 children, 23 like cricket, 16 like football and 8 like both. How many like only cricket? (a) 21 (b) 8 (c) 15 (d) 23
24. 24.In a class of 19 children, 9 like cricket, 7 like football and 5 like neither. How many like both? (a) 5 (b) 2 (c) 3 (d) 14
25. 25.In a class of 38 children, 26 like maths, 10 like science and 9 like neither. How many like both? (a) 29 (b) 8 (c) 9 (d) 7
26. 26.In a class of 47 children, 21 like tea, 20 like coffee and 2 like both. How many like neither? (a) 10 (b) 2 (c) 6 (d) 8
27. 27.In a class of 38 children, 23 like tea, 17 like coffee and 12 like both. How many like only tea? (a) 5 (b) 11 (c) 21 (d) 23
28. 28.In a class of 30 children, 14 like dance, 17 like music and 9 like both. How many like only dance? (a) 5 (b) 14 (c) 13 (d) 8
29. 29.In a class of 46 children, 27 like dance, 18 like music and 7 like both. How many like at least one of the two? (a) 31 (b) 45 (c) 46 (d) 38
30. 30.In a class of 24 children, 16 like cricket, 11 like football and 3 like neither. How many like both? (a) 7 (b) 21 (c) 6 (d) 3
31. 31.In a class of 29 children, 8 like mangoes, 19 like bananas and 4 like both. How many like only mangoes? (a) 15 (b) 8 (c) 10 (d) 4
32. 32.In a class of 35 children, 24 like cricket, 20 like football and 10 like both. How many like neither? (a) 11 (b) 1 (c) 2 (d) 10
33. 33.In a class of 44 children, 26 like cricket, 23 like football and 11 like both. How many like at least one of the two? (a) 27 (b) 49 (c) 38 (d) 44
34. 34.In a class of 27 children, 15 like maths, 12 like science and 4 like neither. How many like both? (a) 23 (b) 5 (c) 4 (d) 3
35. 35.In a class of 49 children, 26 like tea, 25 like coffee and 11 like both. How many like neither? (a) 20 (b) 9 (c) 11 (d) 10
36. 36.In a class of 46 children, 28 like cricket, 27 like football and 11 like both. How many like only cricket? (a) 28 (b) 19 (c) 16 (d) 17
37. 37.In a class of 34 children, 15 like maths, 18 like science and 9 like both. How many like at least one of the two? (a) 33 (b) 34 (c) 24 (d) 15
38. 38.In a class of 32 children, 21 like cricket, 10 like football and 2 like both. How many like at least one of the two? (a) 27 (b) 29 (c) 31 (d) 32
39. 39.In a class of 32 children, 8 like mangoes, 21 like bananas and 5 like neither. How many like both? (a) 3 (b) 27 (c) 2 (d) 5
40. 40.In a class of 31 children, 22 like cricket, 6 like football and 3 like both. How many like at least one of the two? (a) 22 (b) 28 (c) 25 (d) 31

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