The average of 13 numbers is 60. Average of the first 7 of them is 57 and that of the last 7 is 61. Find the 8th number?
Options:
A . 46
B . 32
C . 68
D . 51
Answer: Option A
Sum of all the 13 numbers = 13 * 60 = 780 Sum of the first 7 of them = 7 * 57 = 399 Sum of the last 7 of them = 7 * 61 = 427 So, the 8th number = 427 + 399 - 780 = 46.
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