In an exam, there were 25 math qns and 75 nonmath qns. To answer a math qn, a candidate was supposed to spend twice the time he spends to answer a nonmath qn. If the entire exam duration was 2 hrs, find the time he spent on the math qns.

• 48 minutes
  
  Considering candidate uses full 2 hrs. or 120 min. of the exam for answering the questions.
  If candidate spent 'x' min. on non math question and '2x' min. on maths question, then
  (25*2x) +(75*x)=120, x=24/25
  So time spent on math question=25*2*24/25=48 min.
• 9 years agoHelpfull: Yes(80) No(5)
• Let the time taken to answer each Non Math question be x
  Hence time taken to answer each Math question is 2x (given)
  So the time taken to answer 75 Non Math question will be 75 * x = 75x
  So the time taken to answer 25 Math question will be 25 * 2x = 50x
  Entire exam duration is 2hrs = 120 minutes (given)
  Hence 75x+50x=120 , -> 125x=120, x=0.96.
  
  Time he spent on the maths questions = 50x = 50 * 0.96 = 48 minutes ( Answer )
• 9 years agoHelpfull: Yes(21) No(1)
• the ratio of math to non math questions is
  1 : 3
  If time taken to solve nonmath is x, math =>2x
  then the ratio becomes
  2 : 3
  then time spent for math question is
  (2/3) * 120 = 80 min =1hr 20 min
  
  
• 9 years agoHelpfull: Yes(8) No(28)
• It takes 48 minutes for solving those 25 maths question.
  Because,
  let 'x' be the time taken for solving one nonmath qn,
  then, '75x' will be the time taken for solving 75 nonmath qns.
  then, '(25*2x)' will be the time taken for solving those 25 math qns, as it takes twice the time he spends to answer a nonmath qn.
  50x + 75x = 120(min)
  125x = 120
  x = 120/125
  
  x = 0.96(min)
  If this '0.96 minutes' is converted into seconds then it equals to
  '57.6 seconds'.
  For each maths qn we have to spend
  '57.6 second' then for 25 questions, it is
  25 * (2*57.6) = 2880(seconds). (as mentioned above '25*2x' )
  2880 seconds = 48 minutes.
• 9 years agoHelpfull: Yes(8) No(1)
• let x be the time spent to solve the non math qns ,then time spent to solve math qns =2x
  total duration=2hrs=120 mins
  total duration=(x+2x)
  3x=120 ->x=120/3
  x=40 mins
  time spent on math qns=2x=2*40=80mins
• 8 years agoHelpfull: Yes(7) No(5)
• ans:48 mins
  
  25-maths : 75 non maths
  
  for each maths question he will take twice the time as solving non-maths question so
  
  25*2 : 75
  50 : 75
  = 2 : 3
  thus the time taken for solving 2 maths question is equal to time taken to solve 3 non maths question(for the given senario)
  total time =120 mins
  
  for 2:3 ratio
  
  2*120/5=48 mins(for maths question)
  3*120/5=72 mins(for solving non maths question)
  
  
• 8 years agoHelpfull: Yes(4) No(0)
• 80 min.
  consider the time taken to complete non math qs is t and math qs is 2t.
  then x+2x=120,3x=120,x=40.
  then 2x=80min.
• 9 years agoHelpfull: Yes(3) No(15)
• can anyone give proper solution ?
  
• 8 years agoHelpfull: Yes(3) No(0)
• 48 minutes
  
  Let time taken for each nonmath question b = x minutes
  Time taken for each math question = 2x minutes
  Hence, 75x + 50x = 120 minutes
  x = 120/125 = 24/25 minutes
  Since each math question takes 2x (=48/25) and there are 25 math questions in all, the answer is 48/25*25 = 48 minutes
• 8 years agoHelpfull: Yes(3) No(0)
• let 25 maths question is solved in 2x time,
  so non maths 25 question be solved in x time....so 75(25x3) question is in 3x time
  total time=2x+3x=120 min
  x=24
  so he spent 2x ie 2x24=48 min on maths paper and 3x ie 3x24=72 min on non maths paper.
• 9 years agoHelpfull: Yes(2) No(2)
• 48 min
  25*2x+75=120
  x=120/125
  =>math=25*2*120/125
  48 min
  
• 8 years agoHelpfull: Yes(2) No(0)
• let x be the time taken to solve non math question thus time taken to solve
• 8 years agoHelpfull: Yes(2) No(1)
• 
  let, time taken for nonmath qns=x;
  and time taken for math qns is TWICE the time taken for nonmath (i.e) 2x
  therefore,(75*x)+(25*2x) =120
  => (75+50)x=120
  =>125x=120
  =>X=24/25
  =>therefore time spent for math qns is 25*2*x=25*2*(24/25)=48 min=0.8 hrs
  
  
• 8 years agoHelpfull: Yes(1) No(0)
• 
  (25*2x)+(75*x) = 120 (ie 2hrs)
  125x = 120 min
  x=24/25;
  25*(2*(24/25))=48
• 8 years agoHelpfull: Yes(1) No(0)
• Let Time be T for Non Math Que and 2T for Math Question . Therefore total time was (25*2T) + 75*T
  125T = 120
  T=24/25...... time spent on math question was 2T therefore time spent for 1 maths question was 2*24/25 mins = 1.96 mins. for 25 MATH QUESTION 25*1.96= 48 mins
• 8 years agoHelpfull: Yes(1) No(1)
• 90 mins.To ans 1 ques he will take 1.2 mins,to math ans for math qns he wll take 1.2+12.*2)*25=90
• 8 years agoHelpfull: Yes(1) No(2)
• ans .....48 min
  Total no of other qus = 75
  Total no of math=25
  Total hrs = 2hr= 120mins
  
  Time taken to complete 1qus = x
  (75*x)+(25*2x)=120
  75x+50x=120
  x=0.96
  
  Therefore , time taken for 75 qus =75*0.96 =72mins and
  time taken for 25qus =25*2(0.96)= 48 mins
• 7 years agoHelpfull: Yes(1) No(0)
• totally 100 question.time for 120 minits so 1question take time in 1.2minits so 1.2*25=30minits
• 9 years agoHelpfull: Yes(0) No(5)
• 1.92 minutes
  total questions=75 nm + 25m =37.5m+25m=62.5m (according to time taken to solve a qn)
  time for one maths question=120/62.5=1.92mins
• 9 years agoHelpfull: Yes(0) No(0)
• He carries 2 cakes initially .He gives it to the guard at gate1 and gets half of it +1 which sums up to 2. This is the case for all seven gates and he'll be able to have 2 after crossing the 7th gate for his friend.
• 9 years agoHelpfull: Yes(0) No(0)
• 48Considering candidate uses full 2 hrs. or 120 min. of the exam for answering the questions.
  If candidate spent 'x' min. on non math question and '2x' min. on maths question, then
  (25*2x) +(75*x)=120, x=24/25
  So time spent on math question=25*2*24/25=48 min.
• 8 years agoHelpfull: Yes(0) No(0)
• 75t+25*2t=7200 sec
  t=1.92 min
• 8 years agoHelpfull: Yes(0) No(0)
• let t be the time taken to solve a non math question
  let 2t be the time taken to solve a math question
  then total time=2hrs=7200 ssec
  therefore
  75t+25*2t=7200
  125t=7200
  t=57.6sec=1.92 min for one question
  therefore for 25 question =1.92*25=48minutes
• 8 years agoHelpfull: Yes(0) No(0)
• i consider 2 hr as 120 mins. x be the time taken for solving non math qusn. which is the double time of answering the math qusn. so my eqaution is 75x+25(2x)=120.now solve the equation. i got x=.96 and for answering 25 qusn it was 50*.96=48
• 8 years agoHelpfull: Yes(0) No(0)
• 2 cakes.....
  
• 8 years agoHelpfull: Yes(0) No(1)
• 25 math questions=5o non math question
  hence total ques=125 non math ques
  if 125 non math ques take 2 hour,then
  1 non math take 2/125 hour=0.016hour
  hence 50 non math(25 math) take 0.016*50
  answer is 0.8 hours
• 8 years agoHelpfull: Yes(0) No(0)
• 25(2X)+75(x)=120 min
  25(2X)+75(x)=7200 sec
  50X+75X=7200
  125X=7200
  x=7200/125
  x=57.6 sec
  
  75(57.6)=4320 sec= 72 min = 1 hr 12 min
  25(2(57.6))=2880 sec= 48 min
• 8 years agoHelpfull: Yes(0) No(0)
• 120/125=0.96
  0.96*2=1.92
  1.92*25= 48 minutes
• 7 years agoHelpfull: Yes(0) No(0)
• 48 mins. 50 X+75X=120; X= 0.96: time spent on maths ques = 50 * 0.96 = 48 mins
• 7 years agoHelpfull: Yes(0) No(0)
• let x be time taken to solve nonmathquestion
  then 2x will be time taken to solve math problem
  x+2x=120 min
  3x=120
  x=40
  then to solve math question=80min
• 7 years agoHelpfull: Yes(0) No(1)
• a math question
  
  so ans is ..=48min
• 7 years agoHelpfull: Yes(0) No(0)
• actually total question 100
  total timeperiod 120 mins
  in that each question have 1.2mins to solve after that the question have double in non maths of 75
  so 75*1.2=90 mins
  remaining we have only 30 mins to solve maths question
  so ans is 30 mins in 25 math questions
• 7 years agoHelpfull: Yes(0) No(2)
• 2 hrs = 120 minutes
  Let x = number of minutes spent on each non-math question
  Let 2x = number of minutes spent on each math question
  
  75( x) + 25(2x) = 120
  75x + 50x = 120
  125x = 120
  x = 0.96
  
  50(2(0.96)) = 50(1.92) = 96
  
  Students should spend 40 total minutes on the mathematics portion of the examination.
• 7 years agoHelpfull: Yes(0) No(1)
• 41.18 minute
• 7 years agoHelpfull: Yes(0) No(0)
• 38.75 minutes
  
  
  
  (25*2x) +(75*x)=120, x=24/25
  (24/25)*60=57.60---->time for one non math question
  57.60*2=115.20=1:55min---->time for one math question
  1.55*25=38.75min
• 7 years agoHelpfull: Yes(0) No(1)
• 2hours=120min
  let y=math question
  let x=non-math question
  y=2x
  120=x+y
  120=0.5y+y
  120=1.5y
  y=80
• 7 years agoHelpfull: Yes(0) No(0)
• Let the time taken to answer each Non Math question be x
  Hence time taken to answer each Math question is 2x (given)
  So the time taken to answer 75 Non Math question will be 75 * x = 75x
  So the time taken to answer 25 Math question will be 25 * 2x = 50x
  Entire exam duration is 2hrs = 120 minutes (given)
  Hence 75x+50x=120 , -> 125x=120, x=0.96.
  
  Time he spent on the maths questions = 50x = 50 * 0.96 = 48 minutes ( Answer )
• 7 years agoHelpfull: Yes(0) No(0)
• 2 hours = 120 mins
  2x=y
  120/3=40 mins
  therefore 2*40=80 mins time taken for math questions
• 6 years agoHelpfull: Yes(0) No(0)
• 80min i.e 1hr20min
• 6 years agoHelpfull: Yes(0) No(0)
• 2hours= 2*60min=120min
  Non math ques req x mins
  Math ques req 2x mins
  x+2x=120
  3x=120
  x=40
  The time he spent on nonmath ques=80
  2(40)=80
• 6 years agoHelpfull: Yes(0) No(0)
• Let time taken to solve a non math question be x.
  So time taken to solve a math question be 2x ( twice the time)
  Total Duration = 2 hrs = 120 minutes
  Total Time taken to solve all questions = 75 * x + 25 * 2x = 120 min
  75x + 50x = 120
  125x = 120
  x = 120 . 125
  x = 0.96 minutes
  To solve math questions = 0.96 * 2 * 25 = 48 minutes
• 11 Months agoHelpfull: Yes(0) No(0)