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Question 12

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.


Solution

Cost of a dozen pens (12 pens) = Rs 180

Cost of 1 pen = 18012 = Rs 15

Cost of 8 ball pens = Rs 56

Cost of 1 ball pen = 568 = Rs 7

Ratio of cost of one pen to that of one ball pen

= Cost of 1 penCost of 1 ball pen

= 157 = 15:7      


Mathematics

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