Cost of a dozen pens is ₹180 and cost of 8 ball pens is ₹56. Find the ratio of the cost of a pen to the cost of a ball pen.

Cost of a dozen pens (12 pens) = ₹180
∴ Cost of 1 pen = 180/12=₹15
Cost of 8 ball pens = ₹56
∴ Cost of 1 ball pen = 56/8 = ₹7
Ratio of cost of one pen to that of one ball pen = 15/7 = 15:7

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