The average of 20 numbers is 40. If the sum of the first 10 numbers is 380, what is the average of the remaining 10 numbers?
Show answer & explanation
Correct answer: A
Explanation
Total number of terms = 20, Average = 40
Sum of the first 10 terms = 380
Total sum = 20 × 40 = 800
Sum of the remaining 10 terms = 800 − 380 = 420
Average = 420 / 10 = 42