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 maths problem as for each other question.How many minutes should be spent on mathematics problems

  1. 36

  2. 72

  3. 108

  4. 44
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let t = time per non-math question. Math questions get 2t each. Total time: 50(2t) + 150(t) = 180 minutes. 250t = 180, so t = 0.72 min. Time on math problems = 50 × 2t = 100 × 0.72 = 72 minutes.

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