A man could buy a certain number of notebooks for Rs.300. If each notebook cost is Rs.5 more, he could have bought 10 notebooks less for the same amount. Find the price of each notebook?

One Answer on this Question

1. According to the question:
   ⇒(x+5)(y−10)=300
   ⇒xy+5y−10x−50=xy
   ⇒5×300​−10x−50=0
   ⇒−150+x2+5x=0
   ⇒x2+15x−10x−150=0
   ⇒x(x+15)−10(x+15)=0
   ⇒x=10 or −15
   Price cannot be negative
   So, As x>0,x=10.

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