The average of 10 numbers is 47. What should be the 11
th
number added to them to make the average 53?
- A211
- B312
- C113
- D412
Solution & Step-by-step Explanation
Sum of the first 10 numbers:
Sum
10
=10×47=470
Sum of 11 numbers required for an average of 53:
Sum
11
=11×53=583
The 11
th
number is the difference between the two sums:
11
th
number=583−470=113
Sum
10
=10×47=470
Sum of 11 numbers required for an average of 53:
Sum
11
=11×53=583
The 11
th
number is the difference between the two sums:
11
th
number=583−470=113