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There are 200 questions on a 3-hour examination. Among these
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04 Oct 2020, 22:28
04 Oct 2020, 22:28
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Question Stats:
46% (00:50) correct
53% (01:31) wrong based on 15 sessions
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There are 200 questions on a 3-hour examination. Among these questions are 50 mathematics problems. It is suggested that twice as much time be allowed for each maths problem as for each other question. How many minutes should be spent on mathematics problems?
A. 36 mins
B. 60 mins
C. 72 mins
D. 100 mins
E. 120 mins
A. 36 mins
B. 60 mins
C. 72 mins
D. 100 mins
E. 120 mins
Re: There are 200 questions on a 3-hour examination. Among these
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05 Oct 2020, 02:04
05 Oct 2020, 02:04
Expert Reply
3*60 = 180 minutes
2x = minutes spent on a math problem
\(x(200-50) + 2x(50) = 180
x(150) + 2x(50) = 180
150x + 100x = 180
250x = 180
x = 0.72\) minutes
C is the answer
2x = minutes spent on a math problem
\(x(200-50) + 2x(50) = 180
x(150) + 2x(50) = 180
150x + 100x = 180
250x = 180
x = 0.72\) minutes
C is the answer
Re: There are 200 questions on a 3-hour examination. Among these
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05 Oct 2020, 07:08
05 Oct 2020, 07:08
2
Maths problems: 50
Other problems: 200 - 50 = 150
Let time for other problems: x
time for maths problems: 2x
50(2x) + 150(x) = 60 * 3
100x + 150x = 180
250x = 180
x=18/25
Time spent on maths: 50(2x) = 100x = 100 * 18/25 = 72 mins
Other problems: 200 - 50 = 150
Let time for other problems: x
time for maths problems: 2x
50(2x) + 150(x) = 60 * 3
100x + 150x = 180
250x = 180
x=18/25
Time spent on maths: 50(2x) = 100x = 100 * 18/25 = 72 mins
