Question

15 books cost Rs. 4875. Find the cost of one book if they all cost the
same.​

Answer 1

Answer:

325

Explanations

15books 4875

1book. ?

1×4875÷15

=325

Answer 2

Answer:

1 book costs 325.

Explanation:

There are 2 methods to solve this.

METHOD 1 :

This is called unitary method. This method is usually uesd to find cost of one book or pen etc. where you have to find one. Here, you have to divide the total by 15.

Therefore, 4875/15 = 325

METHOD 2 :

This is called proportionate method. This method can be used to find the cost of any number not only 1.

Here,

4875:15::x:1

$4875 \times 1 = x \times 15 \\ (4875 \times 1) \div 15 = x \\ 4875 \div 15 = x \\ 325 = x$

Therefore cost of 1 book is Rs. 325

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