Question

as- If the cost of 20 looks is Rs. 180, How much will 15 books cost ?​

Answer 1

Answer:

Cost of 20 books = 180

Therefore, cost of 1 book = 180/20

Cost of 1 book = 9

Therefore , Cost of 15 books = 9 × 15 = 135 -,-"

Answer 2

Answer:

The cost of 15 book is Rs. 135 .

Step-by-step explanation:

Given information,

the cost of 20 book is Rs 180 .

We have to find out the cost of 15 book

As,

The cost of 20 book = 180

The cost of 1 book = $\frac{the \: cost \: of \: 20 \: book }{20}$

The cost of 1 book $= \frac{180}{20}$

By dividing 180 by 20 we get

The cost of 1 book $= 9$

The cost of 1 book is Rs 9 .

The cost of 15 book = The cost of 1 book × 15

The cost of 15 book = $9 \times 15$

The cost of 15 book = $135$

Hence,

The cost of 15 book is Rs. 135 .