Q. A certain straight corridor has four doors, A, B, C and D (in that order) leading off from the same side. How far apart are doors B and C? The distance between doors B and D is 10 meters. The distance between A and C is 12 meters.

• AB+BC=12 and BC+CD =10 hence BC=12-AB and BC= 10-CD hence 12-AB = 10 -CD
  AB-CD = 2 AB-CD is nothing but BC, hence bc= 2
• 10 years agoHelpfull: Yes(21) No(23)
• this one is tricky one
  
  let the distance btn A and B is d1
  B and C is d2
  C and D is d3
  so d1+d2=12
  d2+d3=10
  
  subtracting two eqn we will get d1-d3=2
  or d1=2+d3
  
  now think for a value for d3
  let it is 4 (i am gvng here the crct ans for the 1st attempt u can try another choice)
  so d1=d3+2=6
  now which value will be added so that d1+d2=12 and d2+d3=10
  then the ans for d2 is 6
  
• 10 years agoHelpfull: Yes(6) No(6)
• as they aren't given that doors are equidistant,we can predict the answer between 0m and 10 mts.
• 10 years agoHelpfull: Yes(5) No(7)
• ab+bc = 12
  bc + cd = 10
  after subtracting
  ab - cd = 2
  i.e. bc = 2 final answer
• 10 years agoHelpfull: Yes(5) No(2)
• I think the ans is 5 the distance btw B and D is 10 so B C D it would be 5 and 5 then the dis btw A and C is 12 since 5 is there the 12-5=7 so A to B is 7 B to C is 5 and C to D is 5
• 10 years agoHelpfull: Yes(3) No(10)
• BC=2 because it satifies the condition.since AB+BC=12 AND BC+CD=10
  FROM ABOVE TWO EQUATIONS AB=CD+2 AND ALSO CD=10-BC SO BC=2 SATISIES THE CONDITIONS...
• 10 years agoHelpfull: Yes(3) No(4)
• A----B-------C------D u cnt say until d dstnce btw A and D is knwn @rupali AD-AB-CD is nothng but BC not smply AB-CD ...... @swastik thre r lots of posblts AB=8,BC=4,CD=6... AB=5,BC=7,CD=3..... AB=3,BC=9,CD=1.... AB=6,BC=6,CD=4 are all wrks so thnk dr will b an optn cant b dtrmn .........
• 10 years agoHelpfull: Yes(3) No(1)
• its not possible u need the value of AD to solve the problem..
• 9 years agoHelpfull: Yes(3) No(0)
• additional data is needed to answer the question
• 2 years agoHelpfull: Yes(0) No(0)