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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.

Q. 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.

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Cost of 12 ( a dozen ) pens = Rs 180

Cost of 1 pen =  180 /  12   = Rs 15

Cost of 8 ball pens = Rs 56 

Cost of 1 ball pen =  56 / 8 =  Rs 7  

So,

the ratio of the cost of a pen to the cost of a ball pen:

=\frac{15}{7}=15:7.

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