The average of six numbers is 40. If the average of first four is 45 and that…
2025
The average of six numbers is 40. If the average of first four is 45 and that of last three is 35 , the fourth number is -
- A.
35
- B.
30
- C.
45
- D.
40
Attempted by 25 students.
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Correct answer: C
Answer: 45
Total of six numbers = 40 × 6 = 240.
Sum of the first four = 45 × 4 = 180.
Therefore the sum of the last two = 240 − 180 = 60.
Sum of the last three = 35 × 3 = 105.
The fourth number = (sum of last three) − (sum of last two) = 105 − 60 = 45.