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
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Answer:
66
Step-by-step explanation:
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
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