Question

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.

Answer 1

Dozen of pens are for Rs 180
so one pen costs
180/12=15
Each pen costs Rs 15

cost of 8 ball pens is Rs 56
so one ball pen costs
56/8=7
so each ball pen costs Rs 7

the ration of cost of pen to the cost of ball pen is

15:7

Answer 2

Answer:

=> 15 : 7

Step-by-step explanation:

Here it is given that, we have to find the ratio.

Given that:-

The cost of dozen pens is Rs. $180$

And the cost of $8$ ball pens is Rs. $56$

Use the unitary method to calculate the value of a single unit.

The unitary method is a problem-solving method that begins with determining the value of a single unit.

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

Cost of one pen = $\frac{180}{12}$

Cost of one pen, $C_1=Rs.15$

Now, the cost of $8$ ball pens = Rs. $56$

Cost of one ball pen = $\frac{56}{8}$

Cost of one ball pen, $C_2=Rs.7$

Now consider the cost of a pen in comparison to the cost of a ball pen.

$\frac{C_1}{C_2}=\frac{15}{7}$

Hence, the required ratio is 15 : 7.