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An employee has been given the responsibility to buy some books for prize distribution . In shop A, by reducing the price of book by Rs.10, the employee can buy 4 more books for Rs.800. what is the cost of one book.

Pranshu

8 Years agoGrade 11

1 Answer

Arun

8 Years ago

Dear student

let the price of one book = x

and the no of book that can be purchased with x rs per book = y

now

x* y = 800

(x –10)(y + 4) = 800

now

xy +4x –10y –40 = 800

put xy = 800

800 + 4x – 10y –40 = 800

4x – 10y = 40

put y = 800/x

then a quadratic equation will be formed in x

solve that equation and you will get the cost of one book.

Regards

Arun (askIITians forum expert)

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