Multiple choice general knowledge math & puzzles

The average temperature of days from Monday to Wednesday is 37 degree Celsius and that of from Tuesday to Thursday is 34 degrees. The temperature of Thursday is 4/5th of Monday. Then the temperature of Thursday is

  1. 30

  2. 36

  3. 46

  4. 60
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let $M, T, W, Th$ be the temperatures. $M+T+W = 111$ and $T+W+Th = 102$. Subtracting gives $M - Th = 9$. Since $Th = 4/5 M$, we have $M - 4/5 M = 9 \implies M/5 = 9 \implies M = 45$. Thus, $Th = 4/5 \times 45 = 36$ degrees.

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