Multiple choice general knowledge math & puzzles

There are 200 questions on a 3 hr examination. Among these questions are 50 mathematics problems. It is suggested that twice as much time be spent on each math’s problem as for each other question. How many minutes should be spent on mathematics problems?

  1. 36

  2. 72

  3. 60

  4. 100
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let time for a non-math question be x. Then math questions take 2x. Total time: (50 * 2x) + (150 * x) = 250x. Total time is 180 minutes. 250x = 180, so x = 0.72. Time for math is 100x = 100 * 0.72 = 72 minutes. Other options do not satisfy the time ratio.

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