A shopkeeper buy certain number of books in Rs 80. If he buy 4 more books the new cost price of each book is reduced by Rs 1. Find the number of book initially he buy.
Answers
Answered by
2
Step-by-step explanation:
Correct option is
B
16
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
Answered by
1
Answer:
the number of books brought by shopkeeper is 16
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