The average of 13 numbers is 60.

The average of 13 numbers is 60. Average of the first 7 of them is 54 and that of the last 7 is 61. Find the 8th number?

Quiz

Answer/Solution

25

Steps/Work

Sum of all the 13 numbers = 13 * 60 = 780
Sum of the first 7 of them = 7 * 54 = 378
Sum of the last 7 of them = 7 * 61 = 427
So, the 8th number = 427 + 378 - 780 = 25.
Answer:A

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The average of numbers is . Average of the first of them is and that of the last is . Find the th number?

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