The shopkeeper charged 12 rupees for a bunch of chocolate. but bargained to shopkeeper and got two extra ones, and that made them cost one rupee for dozen less than first asking price .
How many chocolates I received in 12 rupees ?

• 18 chocolates
  
  If originally one could get 'n' chocolates in 12 Rs., then
  Cost of 1 dozen or 12 chocolates=12*(12/n)=144/n
  With 2 chocolates extra in 12 Rs., Cost of 1 dozen chocolates=12*12/(n+2)=144/(n+2)
  According to given condition (144/n) - [144/(n+2)]=1 or
  n^2+2n-288=0, (n-16)(n+18)=0, So n=16,
  With two extra chocolates in 12 Rs. so total,16+2=18 chocolates
• 9 years agoHelpfull: Yes(4) No(1)