Question

If the cost of 20 books is rs. 180 . what will be the cost of 15 such books?

Answer 1

Answer:

rs.135

Step-by-step explanation:

the cost of 20 books is rs. 180

the cost of 1 books is rs. x

20x=180

  x=180/20

 x=9

cost of 15 books

15*9=135

Answer 2

Answer:  135

Step-by-step explanation:

cost of 20 books=180

cost of 1 book=180/20=9

cost of 15 book=9*15=135