Yesterday my mother asked me to buy some stamps. Stamps are available in 2 paise,7paise,10paise,15paise and 20paise denominations. For three types of stamps I was asked to buy five of each. For the other two types of stamps. I was asked to buy six of each. Unfortunately I forgot which I was supposed to buy five of and which to buy six of Luckly my mother had given me the exact money required to buy the stamps , Rs. 3.00 and the shopkeeper was able to give me the correct stamps. Which stamps did I buy?

• 2 paise,7 paise,15 paise denomination stamps each 5 were bought.
  10 paise, 20 paise denomination stamps each six were bought.
• 13 years agoHelpfull: Yes(14) No(0)
• all stamps x 6= 120,90,60,42,12
  all stamps x 5= 100,75,50,35,10
  last 2 of "x6" series cant b there as we want sum to be 300
  and 2nd and 4th must b in "x5" series to make 0 in the end
  so.......
  2 paise,7 paise,15 paise denomination stamps each 5 were bought.
  10 paise, 20 paise denomination stamps each six were bought.
• 13 years agoHelpfull: Yes(9) No(0)
• 2,7 and 15 paise stamps were bought 5 each n remainin 10 and 20 paise stamps were bought 6 each
• 13 years agoHelpfull: Yes(2) No(0)
• the solution given by dharmil is correct i think...
• 13 years agoHelpfull: Yes(1) No(1)
• 5(7+10+2+15+20)=54
  54*5=270
  300-270=30
  i.e. 20+10 extra needed
  Hence 6 stamps of 20p and 10p each were bought. 5 stamps of 2p, 7p, 15p each were bought.
• 6 years agoHelpfull: Yes(0) No(0)