Question

the cost of one exbook and a book is rs.90.if the cost of one bookis 8 time of cost of the one exbook tnen what is the cost of one book.

Answer 1

Answer:

80/-

Step-by-step explanation:

Let book be x

And exbook be y

Given, x=8y

x+y=90

8y+y=90

9y=90

y=10

Cost of exbook is 10/-

x+y=90

x+10=90

x=80/-

Cost of one book is 80/-