A subscriber allow to make a certain number of calls for a lump sum charge of Rs 300. Beyond that, he is charged at certain rate per calls.Two subscriber together makes 1400 calls and where charges Rs 425 and Rs 925 respectively.If a single person had made all the 1400 calls he would have been charged 1550. how many calls are allowed in the first Rs 300.

• 400 calls.
  
  suppose one can make x calls in Rs 300 and then Rs y is charged per call after that limit, then
  (1400-2x)*y=425+925-2*300= 750
  (1400-x)8y= 1550-300=1250
  
  solving , we get
  x=400
  y=1.25 Rs.
• 11 years agoHelpfull: Yes(6) No(0)
• 1400/200 *300
  =210
• 11 years agoHelpfull: Yes(1) No(1)
• Correct equation are
  (1400-2x)*y=750
  (1400-x)*y=1250
  
  After solving these two equation x=400
  Correct answer is 400
• 11 years agoHelpfull: Yes(0) No(0)