The average of 29 numbers is 38. The average of the first 19 numbers is 34 and that of the last 9 numbers is 48. The 20 number is:
Answer & explanation
Correct answer: option 3
Sum of 29 number = 29 × 38 = 1102
Sum of first 19 number = 19 × 34 = 646
Sum of last 9 numbers = 9 × 48 = 432
20th number = 1102 - ( 646 + 432 ) = 24