The average of 11 results is 60 and that of the first 10 is 59. The 11th result is?

Correct option is A

Given:
Average of 11 results = 60
Average of first 10 results = 59

Formula Used:

Average = $$\frac{\text{Sum of values}}{\text{Number of values}}$$​​

Sum of values = Average $$\times$$​ Number of values
Solution:
Let the sum of the 11 results be $$S_{11}.$$​​
​$$S_{11} = 60 \times 11 = 660$$​​
Let the sum of the first 10 results be $$S_{10}.$$​​
​$$S_{10} = 59 \times 10 = 590$$​​
The 11th result is:
11th result = $$S_{11} - S_{10} = 660 - 590 = 70$$​​
Thus, the correct option is (a) 70.