Question

if 1 book cost 80rs then how many books get bought of 2000rs

Answer 1

Answer:

no of books that can be bought = 2000/80 = 25

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Answer 2

Step-by-step explanation:

Let the shopkeeper buy x number of books.

According to the given condition cost of x books =Rs80

Therefore cost of each book =

x

80

Again when he had brought 4 more books

Then total books in this case =x+4

So cost of each book in this case =

x+4

80

According to Question,

x

80

−

x+4

80

=1

x(x+4)

80(x+4)−80x

=1

x

2

+20x−16x−320=0

(x−16)(x+20)=0

x=16orx=−20

Hence the shopkeeper brought 16 books