A boy buys 18 sharpeners (brown or white) for Rs.100. For every white sharpener, he pays one rupee more than the brown sharpener. What is the cost of white sharpener and how much did he buy?

• the cost of white sharpener is 6/-
  and he bought 10 white and 8 brown
• 6 years agoHelpfull: Yes(3) No(7)
• Assume that he bought b, brown sharpeners and w, white sharpeners and the cost of brown sharpener is x and white sharpener is x + 1
  So w(x+1) + bx = 100
  w + b = 18
  b = 18 - w
  Substituting in equation 1, we get w(x+1) + (18 -w)x = 100 so w + 18 x = 100
  Take option 1: If white sharpners are 13, x = (100 - 13) /18 = 4.833
  Option 2, If white sharpeners are 10, x = (100 - 10)/18 = 5 So white sharpeners cost is 6.
  Option 3 Satisfies this condition
  options are
  a) 5, 13 b) 5, 10 c) 6, 10 d) None of these
• 6 years agoHelpfull: Yes(1) No(0)
• cost of white sharpener is 9rs and he bought 2 white sharpeners
• 6 years agoHelpfull: Yes(0) No(10)