SOLUTION: a man bought a certain number of toys for Rs.180. he kept one for his own use and sold the rest for one rupee each more than he gave for them. Besides getting his own toy for nothi

Question 933084: a man bought a certain number of toys for Rs.180. he kept one for his own use and sold the rest for one rupee each more than he gave for them. Besides getting his own toy for nothing, he made a profit of Rs 10. find the number of toys, he intially bought.
Answer by Edwin McCravy(20054) (Show Source): You can put this solution on YOUR website!
A man bought N toys for Rs180.

Each toy cost him Rs

He kept 1 for his own use and sold the other N-1 toys for Rs.

Selling N-1 toys for Rs he received Rs

he made a profit of Rs10, and he paid Rs180, So he received Rs180+Rs10 = Rs190.

So   

RsRs
  




Multiply all terms by N

This is a quadratic equation, get 0 on the right:

Write terms in descending order:

Factor:

, 
, 

He intially bought 20 toys.

Edwin

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