Answer: the price of a book is RS. 5 more then double the price of a pen 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 hope you understand it Reply
Answer:
the price of a book is RS. 5 more then double the price of a pen
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
hope you understand it