# Q. 12.     Cost of a dozen pens is   and cost of ball pens is  . Find the ratio of the cost of a pen to the cost of a ball pen.

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:

.

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