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Average of first five multiples of 3 is

  • 9
  • 11
  • 13
  • 15

Answer: Option A

Explanation:

\begin{aligned}
Average = \frac{3(1+2+3+4+5)}{5} = \frac{45}{5} = 9
\end{aligned}

Similar Questions :

1. Average of five numbers is 27. If one number is excluded the average becomes 25. The excluded number is

  • 35
  • 45
  • 55
  • 65

Answer: Option A

Explanation:

Number is (5*27) - (4*25) = 135-100 = 35

2. Average of 10 numbers is zero. At most how many numbers may be greater than zero

  • 0
  • 1
  • 5
  • 9

Answer: Option D

3. 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:

\begin{aligned}
( \frac {65+67+76+82+85}{5} ) = 75
\end{aligned}

4. The average age of the mother and her six children is 12 years which is reduced by 5 years if the age of the mother is excluded. How old is the mother

  • 40
  • 41
  • 42
  • 43

Answer: Option C

5. The average of six numbers is X and the average of three of these is Y.If the average of the remaining three is z, then

  • x = y + z
  • 2x = y + z
  • x = 2y + z
  • x = y + 2z

Answer: Option B

Explanation:

X =((3y+3z)/6)
or
2X= y + z

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