The average of 11 results is 60 and that of the first 10 is 59. The 11th result is?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 70.
Average = sum of the numbers/total numbers
Sum of the 11 numbers = 11 × 60 = 660
Sum of the first 10 numbers = 10 × 59 = 590
So, the 11th number = 660 - 590 = 70