The total cost of 5 books and 7 pens is 79 rupees and the total cost of 7 books and 5 pens is 77 rupees . Find the cost of 1 book and 2 pens.

The total cost of 8 books and 5 pens is Rs 420 and the total cost of 5 books and 8 pens is Rs 321. Find the cost of 1 book and 2 pens.

3 books and 10 pens together cost Rs 300. 2 books and 3 pens together cost Rs 145. Find the cost of 1 book and 3 pens.

The cost of 2 books and 6 note books is Rs. 34 and the cost of 3 books and 4 note books is Rs. 31. Using the matrices, find the cost of one book and one note-book

The price of 3 chairs and 2 tables is 4500 rupees and price of 5 chairs and 3 tables is 7000 rupees then find the price of 2 chairs and 2 tables.

The price of 3 chairs and 2 tables is 4500 rupees and price of 5 chairs and 3 tables is 7000 rupees then find the price of 2 chairs and 2 tables.

The sum of the costs of one book each of Mathematics, Physics and Chemistry is Rs 210. Total cost of a mathematics book, 2 physics books, and a chemistry book is Rs. 240/- Also the total cost of a Mathematics book, 3 physics book and 2 chemistry books is Rs. 300/-. Find the cost of each book using matrices.