Avg cost of 5 pens and 4 pencils isRs. 36.The avg cost of 5 pens and 9 pencils is Rs.56.Find the total cost of 25 pens and 25 pencils?

• avg cost of 5 pens + 4 pencils = 36
  so , 9 = 36
  1 = 4
  so 25 pens = 25 * 4 = 100
  25 pencils = 25 * 4 = 100
• 8 years agoHelpfull: Yes(3) No(2)
• Avg cost of 5 pens and 4 pencils is Rs. 36
  (5 pen + 4 pencils) 9=36
  therefore 1 pen cost is 36/9=4, so 5 pen cost is 5x4=20 and 4 pencils cost is 4x4=16
  Again, avg cost of 5 pens and 9 pencils is Rs.56
  (5 pen + 9 pencils) 14=56
  therefore 1 pen cost is 56/14=4, so 5 pen cost is 5x4=20 and 9 pencils cost is 9x4=36
  So 25 pen cost is (25/a)=100 and 25 pencils cost is (25x4)=100
• 9 years agoHelpfull: Yes(2) No(0)
• plz give me solution
  
  Avg cost of 5 pens and 4 pencils isRs. 36.The avg cost of 5 pens and 9 pencils is Rs.56.Find the total cost of 25 pens and 25 pencils?
• 8 years agoHelpfull: Yes(0) No(0)