# TCS Ninja Averages Questions and Answers Part 1

Question 1

Time: 00:00:00
The average of first 10 even numbers is?

18

18

22

22

9

9

11

11

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Question 2

Time: 00:00:00
The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.4 the sixth number is?

11.0

11.0

11.3

11.3

11.4

11.4

11.5

11.5

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Question 3

Time: 00:00:00
The average age of three boys is 15 years and their ages are in proportion 3:5:7. What is the age in years of the youngest boy?

15

15

9

9

18

18

21

21

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Question 4

Time: 00:00:00
The average of 1st 3 of 4 numbers is 16 and of the last 3 are 15. If the sum of the first and the last number is 13. What is the last numbers?

8

8

6

6

5

5

2

2

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Question 5

Time: 00:00:00
The average of 9 observations was 9, that of the 1st of 5 being 10 and that of the last 5 being 8. What was the 5th observation?

6

6

7

7

8

8

9

9

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#### PrepInsta User

(a+b+c+d+e+f+g+h+i)/9=9 (a+b+c+d+e+f+g+h+i)=81 (a+b+c+d+e)/5=10 (a+b+c+d+e)=50 a+b+c+d=50-e (e+f+g+h+i)/5=8 (e+f+g+h+i)=40 f+g+h+i=40-e 50-e+e+40-e=81 e=9

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Question 6

Time: 00:00:00
The average of 10 numbers is calculated as 15. It is discovered later on that while calculating the average, one number namely 36 was wrongly read as 26. The correct average is?

12.4

12.4

14

14

16

16

18.6

18.6

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Question 7

Time: 00:00:00
The average age of a husband and a wife is 23 years when they were married five years ago but now the average age of the husband, wife and child is 20 years(the child was born during the interval). What is the present age of the child?

1 year

1 year

2 year

2 year

3 year

3 year

4 year

4 year

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Question 8

Time: 00:00:00
A batsman in his 17th innings makes a score of 85 and their by increasing his average by 3. What is his average after the 17th innings?

34

34

35

35

36

36

37

37

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Question 9

Time: 00:00:00
Visitors to show were charged Rs.15 each on the first day. Rs.7.50 on the second day, Rs.2.50 on the third day and total attendance on the three days were in ratio 2:5:13 respectively. The average charge per person for the whole show is?

Rs.3.00

Rs.3.00

Rs.4.50

Rs.4.50

Rs.5.00

Rs.5.00

Rs.5.50

Rs.5.50

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Question 10

Time: 00:00:00
The average weight of 25 persons sitting in a boat had some value. A new person added to them whose weight was 46 kg only. Due to his arrival, the average weight of all the persons decreased by 5 kg. Find the average weight of first 25 persons?

55

55

62

62

None of these

None of these

57

57

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["0","40","60","80","100"]
["Need more practice! \r\n","Keep trying! \r\n","Not bad! \r\n","Good work! \r\n","Perfect! \r\n"]

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