Question

The price of 5 books and 7 pens is 79 rupees and for 7 books and 5 pens, it is 77 rupees. What is the price of each?​

Answer 1

Answer:

13 ruppee

Step-by-step explanation:

Answer 2

Answer:

Price of each book is Rs.6 and price of each pen is Rs.7

Step-by-step explanation:

Let the price of a book be Rs. x and price of a pen be Rs. y

A/Q

5x +7 y = 79 - - - - - - (1)

And

7x + 5y = 77 - - - - - - (2)

Now,

(1) ×7=> 35x +49y = 553 - - - (3)

(2) × 5=>35x +25Y= 385 - - - (4)

(3)- (4) => 24y = 168

=> y = 168÷24

So, y = 7

By putting y=7 in (2), we get

7x + 5×7 = 77

=> 7x = 77- 35

=> 7x = 42

So, x= 42÷7

= 6

Hence the price of each book is Rs.6 and each pen is Rs.7