The average of 7 numbers is 60. The average of the first three numbers is 50, while the average of the last three is 70. What must be the remaining number ?



The average of 7 numbers is 60. The average of the first three numbers is 50, while the average of the last three is 70. What must be the remaining number ?

A. 75

B. 60

C. 65

D. 55

Answer : B. 60


Explanation:

    The sum of all the seven numbers = 60 * 7 = 420
    The sum of the first three = 50 * 3 = 150
    The sum of the last three = 70 * 3 = 210
    Remaining Number = 420 - (210 + 150) = 60


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