anonymous
  • anonymous
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.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
i got 70 minutes
anonymous
  • anonymous
200/180=1.1 ,twice -2.2 ,2.2*50=110 total=180 minutes,so 180-110=70
anonymous
  • anonymous
is it right?

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Jack1
  • Jack1
x = time spent per maths question y = time spent per other question so 50x + 150y = 180 minutes (3 hrs) and x = 2y (as you spend twice as much time on a maths q) so solve simultaneously
Jack1
  • Jack1
so y = 0.72 minutes (approx 43 seconds ish) and x = 1.44 minutes (approx 1 minute and 26 seconds ish) so 50x = total time spent on maths q's = 72 minutes
Jack1
  • Jack1
so use simultaneous equations to solve

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