The average of 21 results is 20. Average of 1st 10 of them is 24 that of last…
2024
The average of 21 results is 20. Average of 1st 10 of them is 24 that of last 10 is 14. the result of 11’th is :.
- A.
42
- B.
44
- C.
46
- D.
40
Attempted by 98 students.
Show answer & explanation
Correct answer: D
Answer:
40
Explanation:
11’th result = sum of 21 results – sum of 20 results
= 21 x 20 – (24 x 10 + 14 x 10)
= 420 – (240 + 140)
= 420- 380 = 40