• question_answer 12) 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.

Given, cost of 12 pens =  180 $\therefore$ Cost of 1 pen$\text{=}\frac{\text{Total}\,\text{cost}\,\text{of}\,\text{pens}}{\text{Number}\,\text{of}\,\text{pens}}$ =  $\frac{180}{2}=$  15 [$\because$1 dozen = 12 unit] Also given, cost of 8 ball pens =  56 $\therefore$ Cost of 1 ball pen $\text{=}\frac{\text{Total}\,\text{cost}\,\text{of}\,\text{ball}\,\text{pens}}{\text{Number}\,\text{of}\,\text{ball}\,\text{pens}}$ =  $\frac{56}{8}=$ 7 Now, required ratio $\text{=}\frac{\text{Cost}\,\text{of}\,\text{1pen}}{\text{Cost}\,\text{of}\,\text{1}\,\text{ball}\,\text{pen}}=\frac{Rs.15}{Rs.7}=\frac{15}{7}=15:7$

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