The average of 12 numbers is 39. If the number 52 is also included, then what will be the average of these 13 numbers?

Correct option is D

Given:

Average of 12 numbers = 39

Number added = 52

Formula Used: 

Sum of numbers = Average × Number of terms

Solution: ​

Sum of 12 numbers = 39 × 12 = 468

New sum = 468 + 52 = 520

New average =$$\frac{520}{13}$$​ = 40