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 problemsA.36B.72C.60D.100

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rajupriya

  • May 29th, 2008
 

Total number of questions = 200
number of maths prblm      = 50
examination hours             = 3 hours


    converting hours into minutes=3*60=180minutes
    Number of other questions     =200-50=50
    Time taken to complete 150 questions = 150*0.72 mins=108 mins
                    (for maths prblms, the time taken  to complete each ques should be doubled than taken for the other ques)
    Time taken to complete 50 maths prblm=50*1.44 mins=72 mins

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subbu_raja36

  • Jun 13th, 2008
 

other question=150

maths=50

total time=3hours=180 min

as maths takes twice the time of other ..the equation can be made as

x=time for one question

(150*x)+(50*2x)=180

150x+100x=180

250x=180

x=.72 min

for maths 2x so 1.44min

50*1.44=72min

poornachander bethi

  • Oct 2nd, 2009
 

Let M = minutes spend on each math question

then 50M + ( 200 - 50 )( M / 2) = 3 x 60 min.
===> 50M + 150 x M/2 = 180 min.
===> 50M + 75M = 180 min.
===>125M = 180 min.
===> M = 180/125 min.
===> M = 1.44min,

Answer: Each math question spends 1.44 min.
 50 math question spend a total of 72 min.

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