Question

The cost of a book and a pen is 18 The pen costs ₹4.00 more than the nook what is the cost of the book​

Answer 1

Answer:

16 rs is the answer

Step-by-step explanation:

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Answer 2

Answer:

Cost price of the book = ₹7

Step-by-step explanation:

Given :

Cost price of a book and a pen = ₹18

Cost of pen is ₹4 more than the book

To find :

The cost price of the book

Taken :

Let the cost price of the book be x

Let the cost price of the pen be x+4

So , to find the cost price of the book use this formula -:

$\boxed{\sf{x+x+4=18}}$

Solution :

$:\implies\sf{x+x+4=18}$

$:\implies\sf{2x+4=18}$

$:\implies\sf{2x=18-4}$

$:\implies\sf{2x=14}$

$:\implies\sf{x=\cancel{\dfrac{14}{2}}}$

$:\implies\sf{x=Rs.7}$

So , the cost price of the book is ₹7 .

Extra -:

To find the cost price of the pen add ₹4 at the cost price of the book .

Cost price of the pen -:

$:\implies\sf{Rs.7+Rs.4}$

$:\implies\sf{Rs.11}$

So , the cost price of the pen is ₹11 .