An eraser costs ₹3. The cost of 20 erasers is equal to the cost of three pens. The cost of one pen is equal to the cost of two pencils and the cost of six pencils is equal to the cost of five markers. What is the cost of one marker?

₹12

An eraser cost = Rs. 3

Cost of 20 erasers = Cost of 3 pens

3 × 20 = Cost of three pens

Cost of three pens = 60

Cost of one pens = \(\frac{60}{3}\) = 20

Now, cost of one pen = Cost of two pencils

20 = Cost of two pencils

Cost of six pencils = 20 × 3 = 60

Now, cost of six pencils = Cost of five markers

60 = Cost of five markers

Cost of one marker = \(\frac{60}{5}\) = Rs. 12