The average of 50 numbers is 75. If the average of first set of 25 numbers is 65, then what is the average of the second set of 25 numbers?
Answer & explanation
Correct answer: option 3
Let Average of 2nd set of 25 numbers = A
ATQ ,
25 × 65 + 25 × A = 50 × 75
1625 + 25A = 3750
25A = 2125
A = 85
So , Average of 2nd set of 25 numbers = 85