Question

The cost of 8 books is ₹72, then the cost
of 20 such books

Answer 1

Answer:

wkt cost of 8 books is 72

therefore

cost of 8 books= 72

cost of 20 books=?

by doing cross multiplication we get

72×20 divided by 8

finally we get answer

rupee 180

Answer 2

Answer:

The cost of 20 book is ₹ 180 .

Step-by-step explanation:

Given information,

the cost of 8 book is ₹ 72 .

We have to find out the cost of 20 book

As,

The cost of 8 book = 72

The cost of 1 book = $\frac{the \: cost \: of \: 8 \: book }{8}$

The cost of 1 book $= \frac{72}{8}$

By dividing 72 by 8 we get

The cost of 1 book $= 9$

The cost of 1 book is ₹ 9 .

The cost of 20 book = The cost of 1 book × 20

The cost of 20 book = $9 \times 20$

The cost of 20 book = $180$

Hence,

The cost of 20 book is ₹ 180 .