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Question
There are 200 questions on a 3-hour examination . Among these questions 50 are mathematics problems. It is suggested that twice as much time be spent on each math problem as for each other question. How many minutes should be spent on mathematics problem
32
72
60
100
None of these
ANSWER : 2
Descrption
<p>Solution:</p> <p>Let the time taken for one question be x</p> <p>Then math question takes 2x</p> <p>Remaining questions other than math questions are 150</p> <p>then time taken for the remaining questions is 150x</p> <p>Time taken to solve math questions = 50 × 2x = 100x</p> <p>100x + 150x = 3 × 60</p> <p>250x = 180</p> <p>x = 180/250</p> <p>Then time taken for math problems = 2 × 180/250 × 50 = 72</p> <p>minute</p>
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