Question

cost of a book is four times the cost a pen. If the cost of a book is Rs.120, what is the cost of a pen?

Answer 1

let the Cost of a book be x

let the cost of pen be y

1) condition :

x = 4y --------(1)

If cost of book is Rs.120,

Then cost of a pen =???

By substituting the value of x as 120 in equation (1)

4y= 120

=> y= 30

Therefore if the cost of book is Rs. 120 the cost of pen is 30.

Answer 2

Answer:

please refer to the attachment

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