Question

if the price of a book is reduced by rupees 5 a person can buy 5 books extra for rupees 300 find the original list price of the book​

Answer 1

Answer:

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Step-by-step explanation:

Let the original list price of the book be=Rs x

Original number of books purchased=

x

300

When the price of the book is reduced by 5

New Number of books purchased will be=

x−5

300

New number of books purchased-Original number of books purchased=5

∴

x−5

300

−

x

300

=5

⇒

x(x−5)

300x−300x+1500

=5

⇒x

2

−5x=300

⇒x

2

−20x+15x−300=0

⇒x(x−20)+15(x−20)=0

⇒(x−20)(x+15)=0

⇒x−20=0orx+15=0

⇒x=20orx=−15

∴x=20

the original cost of book is Rs 20

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