The average of 9 numbers is 34. If the average of the first 4 numbers is 38 and that of the last 4 is 35, then find the 4th number? About the author Everleigh
Answer: The average of 9 numbers is 40 . If the average of first five numbers is 38 and that of the last five numbers is 50,then what is the fifth number? (1) Avg of 9 numbers = 40. So total of 9 numbers = 9 * 40 = 360. (2) Avg of first 5 is 38. Total of first 5 is = 5 * 38 = 190. (3) Avg of last 5 is 50. Total of last 5 is = 5 * 50 = 250. (4) Total of first 5 plus last 5 = 190 + 250 = 440. (5) Total of first 4 plus fifth + Total of last 4 plus fifth = 440 (6) Total of all 9 numbers + fifth number = 440. (7) 360 + fifth number = 440. (8) Fifth number = 440 – 360 = 80. Answer: Fifth Number = 80. Reply
Answer:
The average of 9 numbers is 40 . If the average of first five numbers is 38 and that of the last five numbers is 50,then what is the fifth number?
(1) Avg of 9 numbers = 40. So total of 9 numbers = 9 * 40 = 360.
(2) Avg of first 5 is 38. Total of first 5 is = 5 * 38 = 190.
(3) Avg of last 5 is 50. Total of last 5 is = 5 * 50 = 250.
(4) Total of first 5 plus last 5 = 190 + 250 = 440.
(5) Total of first 4 plus fifth + Total of last 4 plus fifth = 440
(6) Total of all 9 numbers + fifth number = 440.
(7) 360 + fifth number = 440.
(8) Fifth number = 440 – 360 = 80.
Answer: Fifth Number = 80.