Arithmetic (Average)

1) The average of 10 positive integers is 45. If nine out of the ten numbers are 10, 15, 20, 25, 30, 35, 40, 45 and 50, what is the sum of these numbers?

2) The average of 9 positive integers is 40. If eight out of the nine numbers are 10, 15, 20, 25, 30, 35, 40 and 45, what is the sum of these numbers?

3) The average of 8 positive integers is 35. If seven out of the eight numbers are 10, 15, 20, 25, 30, 35 and 40, what is the sum of these numbers?

4) The average of 7 positive integers is 30. If six out of the seven numbers are 10, 15, 20, 25, 30 and 35, what is the sum of these numbers?

5) The average of 6 positive integers is 25. If five out of the six numbers are 10, 15, 20, 25 and 30, what is the sum of these numbers?

6) The average of 5 positive integers is 20. If four out of the five numbers are 10, 15, 20 and 25, what is the sum of these numbers?

7) The average of 4 positive integers is 15. If three out of the four numbers are 10, 15 and 20, what is the sum of these numbers?

8) The average of 10 numbers is 40. If the first nine numbers are 5, 10, 15, 20, 25, 30, 35, 40 and 45, what is the sum of these numbers?

9) The average of 9 numbers is 35. If the first eight numbers are 5, 10, 15, 20, 25, 30, 35 and 40, what is the sum of these numbers?

10) The average of 8 numbers is 30. If the first seven numbers are 5, 10, 15, 20, 25, 30 and 35, what is the sum of these numbers?

11) The average of 7 numbers is 25. If the first six numbers are 5, 10, 15, 20, 25 and 30, what is the sum of these numbers?

12) The average of 6 numbers is 20. If the first five numbers are 5, 10, 15, 20 and 25, what is the sum of these numbers?

13) The average of 5 numbers is 15. If the first four numbers are 5, 10, 15 and 20, what is the sum of these numbers?

14) The average of 4 numbers is 10. If the first three numbers are 5, 10 and 15, what is the sum of these numbers?

15) The average of 10 consecutive numbers is 35. What is the sum of these numbers?

16) The average of 9 consecutive numbers is 31. What is the sum of these numbers?

17) The average of 8 consecutive numbers is 27. What is the sum of these numbers?

18) The average of 7 consecutive numbers is 23. What is the sum of these numbers?

19) The average of 6 consecutive numbers is 19. What is the sum of these numbers?

20) The average of 5 consecutive numbers is 15. What is the sum of these numbers?

21) The average of 4 consecutive numbers is 11. What is the sum of these numbers?

22) The average of 10 consecutive odd numbers is 37. What is the sum of these numbers?

23) The average of 9 consecutive odd numbers is 33. What is the sum of these numbers?

24) The average of 8 consecutive odd numbers is 29. What is the sum of these numbers?

25) The average of 7 consecutive odd numbers is 25. What is the sum of these numbers?

26) The average of 6 consecutive odd numbers is 21. What is the sum of these numbers?

27) The average of 5 consecutive odd numbers is 17. What is the sum of these numbers?

28) The average of 4 consecutive odd numbers is 13. What is the sum of these numbers?

29) The average of 10 consecutive even numbers is 36. What is the sum of these numbers?

30) The average of 9 consecutive even numbers is 32. What is the sum of these numbers?

31) The average of 8 consecutive even numbers is 28. What is the sum of these numbers?

32) The average of 7 consecutive even numbers is 24. What is the sum of these numbers?

33) The average of 6 consecutive even numbers is 20. What is the sum of these numbers?

34) The average of 5 consecutive even numbers is 16. What is the sum of these numbers?

35) The average of 4 consecutive even numbers is 12. What is the sum of these numbers?

36) The average of 10 positive integers is 45. If nine out of the ten numbers are 10, 15, 20, 25, 30, 35, 40, 45 and 50, what is the tenth number?

37) The average of 9 positive integers is 40. If eight out of the nine numbers are 10, 15, 20, 25, 30, 35, 40 and 45, what is the ninth number?

38) The average of 8 positive integers is 35. If seven out of the eight numbers are 10, 15, 20, 25, 30, 35 and 40, what is the eighth number?

39) The average of 7 positive integers is 30. If six out of the seven numbers are 10, 15, 20, 25, 30 and 35, what is the seventh number?

40) The average of 6 positive integers is 25. If five out of the six numbers are 10, 15, 20, 25 and 30, what is the sixth number?

41) The average of 5 positive integers is 20. If four out of the five numbers are 10, 15, 20 and 25, what is the fifth number?

42) The average of 4 positive integers is 15. If three out of the four numbers are 10, 15 and 20, what is the fourth number?

43) The average of 10 numbers is 40. If the first nine numbers are 5, 10, 15, 20, 25, 30, 35, 40 and 45, what is the tenth number?

44) The average of 9 numbers is 35. If the first eight numbers are 5, 10, 15, 20, 25, 30, 35 and 40, what is the ninth number?

45) The average of 8 numbers is 30. If the first seven numbers are 5, 10, 15, 20, 25, 30 and 35, what is the eighth number?

46) The average of 7 numbers is 25. If the first six numbers are 5, 10, 15, 20, 25 and 30, what is the seventh number?

47) The average of 6 numbers is 20. If the first five numbers are 5, 10, 15, 20 and 25, what is the sixth number?

48) The average of 5 numbers is 15. If the first four numbers are 5, 10, 15 and 20, what is the fifth number?

49) The average of 4 numbers is 10. If the first three numbers are 5, 10 and 15, what is the fourth number?

50) The average of 10 consecutive numbers is 35. What is the largest of these numbers?

51) The average of 9 consecutive numbers is 31. What is the smallest of these numbers?

52) The average of 8 consecutive numbers is 27. What is the largest of these numbers?

53) The average of 7 consecutive numbers is 23. What is the smallest of these numbers?

54) The average of 6 consecutive numbers is 19. What is the largest of these numbers?

55) The average of 5 consecutive numbers is 15. What is the smallest of these numbers?

56) The average of 4 consecutive numbers is 11. What is the largest of these numbers?

57) The average of 10 consecutive odd numbers is 37. What is the largest of these numbers?

58) The average of 9 consecutive odd numbers is 33. What is the smallest of these numbers?

59) The average of 8 consecutive odd numbers is 29. What is the largest of these numbers?

60) The average of 7 consecutive odd numbers is 25. What is the smallest of these numbers?

61) The average of 6 consecutive odd numbers is 21. What is the largest of these numbers?

62) The average of 5 consecutive odd numbers is 17. What is the smallest of these numbers?

63) The average of 4 consecutive odd numbers is 13. What is the largest of these numbers?

64) The average of 10 consecutive even numbers is 36. What is the largest of these numbers?

65) The average of 9 consecutive even numbers is 32. What is the smallest of these numbers?

66) The average of 8 consecutive even numbers is 28. What is the largest of these numbers?

67) The average of 7 consecutive even numbers is 24. What is the smallest of these numbers?

68) The average of 6 consecutive even numbers is 20. What is the largest of these numbers?

69) The average of 5 consecutive even numbers is 16. What is the smallest of these numbers?

70) The average of 4 consecutive even numbers is 12. What is the largest of these numbers?

71) The average weight of a group of 10 people is 90 kg. If one person with a weight of 100 kg joins the group, what is the new average weight?

72) The average weight of a group of 9 people is 85 kg. If one person with a weight of 95 kg joins the group, what is the new average weight?

73) The average weight of a group of 8 people is 80 kg. If one person with a weight of 90 kg joins the group, what is the new average weight?

74) The average weight of a group of 7 people is 75 kg. If one person with a weight of 85 kg joins the group, what is the new average weight?

75) The average weight of a group of 6 people is 70 kg. If one person with a weight of 80 kg joins the group, what is the new average weight?

76) The average weight of a group of 5 people is 65 kg. If one person with a weight of 75 kg joins the group, what is the new average weight?

77) The average weight of a group of 4 people is 60 kg. If one person with a weight of 70 kg joins the group, what is the new average weight?

78) The average of 10 numbers is 35. If one of the numbers is 50, what is the average of the remaining 9 numbers?

79) The average of 9 numbers is 30. If one of the numbers is 40, what is the average of the remaining 8 numbers?

80) The average of 8 numbers is 25. If one of the numbers is 30, what is the average of the remaining 7 numbers?

81) The average of 7 numbers is 18. If one of the numbers is 20, what is the average of the remaining 6 numbers?

82) The average of 6 numbers is 12. If one of the numbers is 18, what is the average of the remaining 5 numbers?

83) The average of 5 numbers is 16. If one of the numbers is 20, what is the average of the remaining 4 numbers?

84) The average of 5 numbers is 20. If one of the numbers is 30, what is the average of the remaining 4 numbers?

85) The average age of a family of 5 members is 25 years. If the age of the youngest member is 10 years, what is the average age of the remaining family members?

86) The average of three numbers is 15. If two of the numbers are 10 and 20, what is the third number?

87) What is the average of 12, 15, 20 and 25?