Question : The average of 20 numbers is 30 and that of the other 30 numbers is 50. What is the average of all the numbers?
Option 1: 42
Option 2: 47
Option 3: 44
Option 4: 45
Correct Answer: 42
Solution :
Total numbers = 20 + 30 = 50
Average =
=
=
=
Hence, the correct answer is 42.