The average of 11 numbers is 30 If the average of first six numbers is 17 5 and that of last six is ...........

Quantitative Aptitude ( CCS) Average

The average of 11 numbers is 30. If the average of first six numbers is 17.5 and that of last six is 42.5, then what is the sixth number?

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Explanation:

Calculate total of 11 numbers by multiplying it by average value 30 = 11 x 30 = 330
Calculate total of first six members by multiplying it by average value 17.5 = 17.5 x 6 = 105
Calculate total of last six members by multiplying it by average value 42.5 = 42.5 x 6 = 255
Therefore, we can find sixth number by adding value of first six and last six numbers and subtracting it from the total value of 11 numbers.
Sixth number =(105 + 255)- 330 = 30

Hence, option 1 is the correct answer.