Cost of a dozen pens is Rs. 180 and cost of 8 ball pens is Rs. 56. Find the ratio of the cost of a pen to the cost of a ball pen.
It is given in the question that,
Cost of dozen of pens = Rs. 180
Therefore,
Cost of 1 pen = 
= Rs. 15
Also,
Cost of a ball pen = 
= Rs. 7
Therefore,
Required ratio = 
= 
23