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Find the average of first 10 multiples of 7

  • 35.5
  • 37.5
  • 38.5
  • 40.5

Answer: Option C

Explanation:

=7(1+2+3+...+10)10



=7(10(10+1))10×2


=7(110)10×2=38.5

Similar Questions :

1. A batsman makes a score of 87 runs in the 17th match and thus increases his average by 3. Find his average after 17th match

  • 36
  • 37
  • 38
  • 39

Answer: Option D

Explanation:

Let the average after 17th match is x
then the average before 17th match is x-3

so 16(x-3) + 87 = 17x
=> x = 87 - 48 = 39

2. Average of 10 matches is 32, How many runs one should should score to increase his average by 4 runs.

  • 70
  • 76
  • 78
  • 80

Answer: Option B

Explanation:

Average after 11 innings should be 36

So, Required score = (11 * 36) - (10 * 32)
= 396 - 320 = 76

3. Average age of boys in a class is 16 years and average age of girls is 15 years, what is the average age of all

  • 15.5
  • 15
  • 16
  • Cant be computed

Answer: Option D

Explanation:

As number of girls and boys is not given so result cant be computed

4. Average of first five multiples of 3 is

  • 9
  • 11
  • 13
  • 15

Answer: Option A

Explanation:

Average=3(1+2+3+4+5)5=455=9

5. Reeya obtained 65, 67, 76, 82 and 85 out of 100 in different subjects, What will be the average.

  • 70
  • 75
  • 80
  • 85

Answer: Option B

Explanation:

(65+67+76+82+855)=75

Read more from - Average Questions Answers
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