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The average of 11 numbers is 63. If the average of first six numbers is 60 and the last six numbers is 65, then the 6th number is
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- 57
- 60
- 62
- 64
- 57
Correct Option: A
Given , Sum of 11 numbers = 63 × 11 = 693
Sum of the first 6 numbers = 60 × 6 = 360
and Sum of the last 6 numbers = 65 × 6 = 390
∴ Sixth number = Sum of the first 6 numbers + Sum of the last 6 numbers – Sum of 11 numbers
Sixth number = 360 + 390 – 693 = 57
