A subscriber is allowed to make a certsin number of telephone calls for a lump sum charge of rs 300.beyond that he is charged at a caertain rate per call. Two subscribers together make 1400 were chage rs 425 and 925 respectively. if a single person had made all of the 1400 call would have charged rs 1550. how many telephon calls are allowed for the first rs 300?
1.300 2. 350 3. 400 4.450

• let no. of calls for 300=x
  now the two subscriber made 1400 total calls
  so first subscriber made charged call for (425-300)=125,second made for (925-300)=625
  let first man made y calls for 125 rs,second will make 5y calls as 625/125=5
  now both will make total 2x calls for 300 each
  so we get 2x+6y=1400
  now in second case person will make x calls for 300 and 10 y for 1250(1550-300)
  now 2nd eqn x+10y=1400
  solving both we get x=400
  
• 10 years agoHelpfull: Yes(48) No(1)
• 400 is correct.
  
  
  1400-----1350(425+925)
  
  2*x+(1400-2*x)=300+300+750
  
  put x=400
  
  800+600=600+750
  
  now for 600 call there is Rs=750.
  so for one call there is Rs=750/600=1.25 -------(1)
  
  
  now same thing happen with single person
  1400-----------1550
  
  x+(1400-x)=300+1250
  
  put x=400
  
  400+1000=300+1250
  
  now for 1000 call there is Rs=1250.
  so for one call there is Rs=1250/1000=1.25-------(2)
  
  (1) and (2) both are equals...
• 10 years agoHelpfull: Yes(7) No(1)
• 400
  Solv by options
• 10 years agoHelpfull: Yes(2) No(0)
• 400
  let x telephone calls are allowed for the first rs 300.
  1 call charge to two subscriber without pack =(425+925-300-300)/(1400-2x)
  1 call charge to one subscriber without pack =(1550-300)/(1400-x)
  equating two will get x=400
• 10 years agoHelpfull: Yes(1) No(0)
• may b 350 r 450
• 10 years agoHelpfull: Yes(0) No(5)
• 350
  a/c
  simple call rate = 1550/1400 = 31/28
  using this we can proceed
  let in 300 rs the total number of given call is x.
  1400 - 2x = 750
  after that just hit and try the x value from given alternatives.
• 10 years agoHelpfull: Yes(0) No(4)