The sum of five numbers is 655. The average of the first two numbers is 78 and the third number is 121. Find the average of the remaining two numbers?

Correct option is B

Given:

Sum of 5 numbers = 655

Average of first 2 numbers = 78 

Sum of first 2 = 78 × 2 = 156

Third number = 121

Formula Used:

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

Solution :

Sum of first 2 = 156

Sum of first 3 = 156 + 121 = 277

Sum of last 2 = 655 - 277 = 378

Average of last 2 =$$\frac{378}{2} = 189$$​