Average temperature of Monday, Tuesday, Wednesday and Thursday was 38 degree C…

2024

Average temperature of Monday, Tuesday, Wednesday and Thursday was 38 degree C and of Tuesday, Wednesday, Thursday and Friday was 40 degree C. Temperature on Monday was 30. Then what was temperature on Friday ?

  1. A.

    43

  2. B.

    38

  3. C.

    53

  4. D.

    63

Attempted by 19 students.

Show answer & explanation

Correct answer: B

Solution: Compute the required temperature step by step.

  1. Average of Monday, Tuesday, Wednesday and Thursday is 38, so the sum of those four days is 4 × 38 = 152.

  2. Average of Tuesday, Wednesday, Thursday and Friday is 40, so the sum of those four days is 4 × 40 = 160.

  3. Subtract the first sum from the second: (Tuesday + Wednesday + Thursday + Friday) − (Monday + Tuesday + Wednesday + Thursday) = Friday − Monday = 160 − 152 = 8.

  4. Given Monday = 30, therefore Friday = Monday + 8 = 30 + 8 = 38.

  5. Answer: 38.

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