Question

if 12 books cost RS.90,then the cost of 15 books is​

Answer 1

Answer:

112.5

Step-by-step explanation:

90/12 = 7.5

one book costs ₹7.5

cost of 15 books = 15* 7.5 = 112.5

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Answer 2

Answer:

The cost of 15 book is Rs 112.5 .

Step-by-step explanation:

Given information,

the cost of 12 books is Rs 90 .

We have to find out The cost of 15 book

As,

The cost of 12 books = Rs. 90

The cost of 1 book = $\frac{the \: cost \: of \: 12\: book}{12}$

The cost of 1 book $= \frac{90}{12}$

By dividing 90 by 12 we get

The cost of 1 book $= 7.5$

The cost of 1 book is Rs. 7.5 .

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

The cost of 15 book= $7.5 \times 15$

The cost of 15 book= $112.5$

Hence,

The cost of 15 book is Rs 112.5 .