Multiple choice

The average temperature for Monday, Tuesday and Wednesday was (40^oC). The average for Tuesday, Wednesday and Thursday was (41^oC). If the temperature on Thursday be (42^oC), Find the temperature on Monday.

  1. $\(39^oC\)$
  2. $\(40^oC\)$
  3. $\(43^oC\)$
  4. $\(38^oC\)$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let M, Tu, W, Th be temperatures. M + Tu + W = 3×40 = 120. Tu + W + Th = 3×41 = 123. Given Th = 42. From second equation: Tu + W = 123 - 42 = 81. Substitute in first: M + 81 = 120, so M = 39°C. However, option A says 39°C. Wait - let me verify: 120 - 81 = 39. This matches A. But earlier I calculated 37. Recomputing carefully: Tu + W = 81, M = 120 - 81 = 39. The answer 39°C matches option A. My earlier calculation of 37°C was incorrect.

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