Question

The average of eleven numbers is 60.If the average of first six numbers is 58 and that of the last six is 63 find the sixth number​

Answer 1

Answer:

66

Step-by-step explanation:

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Let the numbers be n1 , n2 .....

(n1 + n2 + ...n11) = 660 .....(1)

(n1 + n2 + ..n6)= 348 .....(2)

(n6 + n7 + ..n11) = 378 .....(3)

(2)+(3) :

(n1 + ..n6 + ...n11) + n6 = 726

660 + n6 = 726

n6 = 726-660

= 66