61 . The average age of 12 students is 20 years. If the age of one more student is included the average decreases by 1, what is the age of the new student?
  • A. 5
  • B. 7
  • C. 9
  • D. 11
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62 . The average age of 15 people is 25 years. Out of them, total age of 2 people is 115 years. What is the average age of the other 13 people?
  • A. 20 years
  • B. 25 years
  • C. 22.5 years
  • D. 57.5 years
  • E. None of these
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63 . The average age of 6men, 8women and 1 young boy is 35 years. What is the age of the boy,if the average age of the men is 40 and that of the women is 34?
  • A. 10
  • B. 11
  • C. 12
  • D. 13
  • E. 14
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64 . The average age of husband,wife and their child 3years ago was 27 years and that of wife and the child 5years ago was 20years.The present age of husband is :
  • A. 35years
  • B. 40years
  • C. 45years
  • D. 50years
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65 . The average age of the father and two sons is 16 years and 7 months. If the mother is 14 years and 4 months and same two sons is 12 years and 7 months. If the mother is 24 years and 4 months old , then what is the age difference between the father and the mother ?
  • A. 11 years and 5 months
  • B. 12 years and 5 months
  • C. 13 years and 6 months
  • D. 11 years and 3 months
  • E. 10 years and 7 months
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66 . The average cost of 5 apples and 4 mangoes is 36 taka. The average cost of 7 apples and 8 mangoes is 48 taka. Find the total cost of 24 apples and 24 mangoes.
  • A. 1044
  • B. 2088
  • C. 720
  • D. 324
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67 . The average daily income of Mr. A and Mr. B is Tk. 350 , of Mr. B and Mr. C is Tk. 365 and of Mr. A and Mr. c is tk. 340 . what is the weekly income of Mr. A if he works 5 days in a week?
  • A. Tk. 1,625
  • B. Tk. 1,775
  • C. Tk. 1,600
  • D. None of these
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68 . The average income of 10 BBA graduates is Tk. x. The individual income of 5 MBA graduates is Tk. 100y each. What is the average income of these 15 graduates?
  • A. (10x+100y)/15
  • B. (x+100y)/15
  • C. (10x+500y)/15
  • D. None of these
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69 . The average of 10 numbers is -10. If the sum of 6 of them is 100, then what is the average of the other 4 numbers?
  • A. -100
  • B. -50
  • C. 50
  • D. 100
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70 . the average of 10 numbers is 7. what will be the new average if each of the numbers is multiplied by 8?
  • A. 45
  • B. 52
  • C. 56
  • D. 55
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71 . The average of 100 observations in a study was calculated as 49.7 . Later it was revealed that one of the observations was misread as 64 instead of 94. What will be the correct average ?
  • A. 52.5
  • B. 49.8
  • C. 55
  • D. 50
  • E. None of these
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72 . The average of 20, 70 and x is 40. If the average of 20, 70, x and y is 50, then y =?
  • A. 100
  • B. 80
  • C. 70
  • D. 60
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73 . The average of 3 numbers is 24. If 2 of the number are 21 and 23,what is the 3rd number?
  • A. 20
  • B. 24
  • C. 26
  • D. 28
  • E. 30
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74 . The average of 3 numbers is 7. If 2 of the numbers are zero, then what is the 3rd number?
  • A. 15
  • B. 17
  • C. 19
  • D. 21
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75 . The average of 5 consecutive numbers is n. If the next two numbers are also included, the average will :
  • A. increase by 1.5
  • B. increase by 1
  • C. remain the same
  • D. increase by 2
  • E. None of these
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