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. .
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Answer :
15:7
Step by step explanation :
1 dozen= 12 pens
Cost of a dozen pens = ₹180
Cost of 1 pens = 180:12
= 90:6
= 30:2
= 15 = ₹15
Cost of 8 ball pens = ₹56
Cost of 1 ball pen = 56:8
= 7 = ₹7
Ratio of cost of one pen to that of one ball pen = 15/7
= 15:7 Ans.
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