Question

If 4 books cost rupees 36 then, what is the cost of 10 books ?

Answer 1

The solution is done below :

It is given that,

The cost of 4 books is = 36 rupees

To find : The cost of 10 books.

To know the cost of 10 books, we have to first find the cost of 1 book. And after knowing the cost of 1 book, we have to multiply the cost of 1 book with 10. By doing this, we will get the correct result.

If the cost of 4 books is 36

Then, cost of 1 book will be =

$\frac{36}{4}$

$4$

So, cost of 1 book is 4 rupees.

Now,

Cost of 10 books = (4 x 10) rupees

= 40 rupees

Therefore, 40 rupees is the cost of 10 books

Answer 2

If 4 books cost rupees 36 then the cost of 10 books is 90 rupees

Solution:

Given that , 4 books cost rupees 36

To find: Cost of 10 books

Let "n" be the cost of 10 books

Now, we know that ,  

4 books ⇒ 36 rupees

Then , 10 books ⇒ n rupees

Now, by criss cross method ( i.e. equating the products of diagonally ordered items)

So, $4 \times n = 10 \times 36$

$n = 10 \times 9$

n = 90  

Hence, 10 books costs 90 rupees

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