Question

The average of 13 numbers is 10.The average of first 6 numbers is 8 and that of the last 6 numbers is 10. What will be the 13th number?

A 30 Correct Answer Incorrect Answer
B 26 Correct Answer Incorrect Answer
C 42 Correct Answer Incorrect Answer
D 22 Correct Answer Incorrect Answer

Solution

Sum of 13 numbers = 13 ×10 = 130 Sum of first 6 numbers = 6×8 = 48 Sum of last 6 numbers = 6×10 = 60 Therefore, 13thnumber = 130 – (48 + 60) = 22

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