Correct Answer - Option 2 : 60
Given:
Average of the 6 numbers = 50
The First number = (1/4) × Sum of the other five numbers
Formula Used:
Average = Sum of all the observations/Total number of observations
Calculation:
Total sum = 6 × 50 = 300
According to the question,
First number = (1/4) × (300 – first number)
⇒ (5/4) × First number = 75
⇒ First number = 75 × (4/5) = 60
∴ The first number is 60
