Question

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

Answer 1

Answer:

4 books cost =36 rupees

1 book cost =36/4=9

therefore 10 books=9×10= Rs 90

Step-by-step explanation:

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Answer 2

Answer:

10 books costs 90 rupees

Step-by-step explanation:

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 x n = 10 x 36

n = 10 x 9

n = 90

Hence, 10 books costs 90 rupees.

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