Question

The total cost of 5 books and 7 pages is Rs. 79. The total cost of 7 books and 5 pages is Rs. 77. It is comes to Rs.


Ans: ​

Answer 1

Answer:

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Step-by-step explanation:

Answer

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Let the cost of 1 book =x

And the cost of 1 pen =y

⇒5x+7y=79

⇒7x+5y=77

Equation (1) × 7 : 35x+49y=79×7

Equation (2) × 5 : 35x+25y=77×5

Subtract two equations ;

⇒24y=168

⇒y=7

⇒x=6

Total cost of 1 book and 2 pens =x+2y=6+14=20

Answer 2

Answer:

No of pages

Step-by-step explanation:

Because extra pages then extra cost