If 15 pens cost Rs. 35, what is the cost of 39 pens?

If 8 pens cost Rs. w, find the cost of 5 such pens.

If cost of 12 pens is Rs84. then what is the cost of 10 such pens ?

One pencil costs Rs.2 and one fountain pen costs Rs.15. What is the cost of x pencils and y fountain pens?

The cost of 1 pen is Rs. 16 and the cost of 1 pencil is Rs. 5. What is the total cost of x pens and y pencils.

cost of 8 pens and 4 pencils is Rs176 and the cost of 2 pens and 2 pencils is Rs 48. What is the cost of one pen? (a) Rs 12 (b) Rs 14 (c) Rs 16 (d) Rs 18 (e) None of these

The cost of 3 pens is Rs. 30, then the cost of 2 pens is Rs. 20.

The cost of 1 dozen pens is Rs. 24. Find the cost of 30 pens.

The cost of 5 pens and 8 pencils Rs. 31. What would be the cost of 15 pens and 24 pencils?

If the cost of a pen is rs. 32.50, find the cost of 24 such pens.

The cost of 2 books, 6 notebooks and 3 pens is Rs. 40. The cost of 3 books, 4 notebooks and 2 pens is Rs. 35 , while the cost of 5 books, 7 notebooks and 4 pens is Rs. 61. Using these informations and matrix , find the cost of one book , one notebook and one pen separately .