The average of 10 numbers is 47. What should be the 11th number added to them to make the average 53?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 113.
Total sum of 10 numbers=10 × 47 = 470
To make the average of 11 numbers = 53, the total sum must be: 11 × 53 = 583
Let the new total be (470 + x)
470 + x = 583
x = 583 − 470 = 113