Cost of 5 pens and 7 note books is Rs 82 and cost of 4 pens and 4 note books is Rs 52. Find the cost of 2 note books and 3 pens

The cost of 3 pens and 5 pencils is Rs 40. Find the cost of 12 pens and 20 pencils

The total cost of 5 pens and 2 books is Rs. 150, while the total cost of 7 pens and 3 books is Rs. 219. Find the total cost of 3 pens and 1 book.

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.

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

6 note- books cost Rs. 156, find the cost of 54 such note-books.

4 Pens and 6 Pencils cost Rs. 80. Find the cost of 12 pens and 18 pencils.

If the cost of two pens and three books is ₹ 69 and that of three pens and two books is ₹ 66. Find the difference in the cost of each book and each pen. ( in ₹)