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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
Given:
The cost of a dozen pens is $ Rs.180$ and the cost of 8 ball pens is $Rs. 56$.
To do:
We have to find the ratio of the cost of a pen to the cost of a ball pen.
Solution:
Cost of a dozen pens $= Rs. 180$
We know that,
A group of 12 is defined as dozen.
Dozen$= 12$
This implies,
Cost of 1 pen$=\frac{Rs.\ 180}{12}$
$=Rs.\ 15 $
Cost of 8 ball pens $= Rs.\ 56$
Cost of 1 ball pen $=\frac{Rs.56}{8}$
$= Rs.\ 7$
The ratio of the cost of a pen to the cost of a ball pen is $15 : 7$.
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