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.

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

The cost of 6 pens and 3 pencils is Rs 84. One- third of the cost of one pen is equal to the cost of one pencil.What is the total cost of 4 pens and 5 pencils? (a) Rs 66( b) Rs 68 (c) Rs 72 (d) Rs 78 (e) None of these

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

If the cost of 30 pencils is Rs. 240, what is the cost of 18 pencils?

IF the cost of 15 pens is Rs 150 what is the cost of 7 pens ?

Average cost of 10 pens is Rs.200 and average cost of 10 pencil is Rs.100. Find the average cost of all pens and pencils.

The total cost of 12 pens and 5 pencils is equal to Rs 111. Also, the cost of 1 pencil is Rs 5 less than the cost of 1 pen. What will be the cost of 8 pens and 9 pencils?

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