Question

Find the ratio of the price of pencil to that of ball pen, if pencils cost Rs 16 per score and ball pens cost Rs 8.40 per dozen.

Answer 1

We have
Cost of 1 score of pencils = Rs. 16
Since 1 score = 20 items,
Cost of one pencil = Rs. $\left({\displaystyle \frac{16}{20}}\right)$ = Rs. 0.8
Cost of 1 dozen ball pens = Rs. 8.40
Since 1 dozen =12 items,
Cost of one ball pen = Rs. $\left({\displaystyle \frac{8.40}{12}}\right)$ = Rs. 0.7
So, price of pencil : price of ball pen = 0.8 : 0.7 = $\frac{0.8}{0.7}$ = $\frac{8}{7}$
Price of pencil : price of ball pen = 8 : 7