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The average of 9 numbers is 30. The average of first 5 numbers is 25 and that of the last 3 numbers is 35. What is the 6th number?
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- 20
- 30
- 40
- 50
- 20
Correct Option: C
According to question,
The average of 9 numbers = 30
Now,The total of 9 numbers = 30 × 9 = 270
The average of first 5 numbers = 25
∴ The total of first 5 numbers = 25 × 5 = 125
and Total of last 3 numbers = 3 × 35 = 105
Required answer = The total of 9 numbers - ( The total of first 5 numbers + Total of last 3 numbers )
Hence, required answer = 270 – (125 + 105) = 270 – 230 = 40
