Answer

Verified

452.1k+ views

Hint: The unitary method, in essence, is all about finding the “per unit value”. The unitary method is a technique for solving a problem by first finding the value of a single unit.

Complete step-by-step answer:

Now use the unitary method to find the value of a single unit.

Cost of a dozen pens (12 pens) \[ = Rs.180\]

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

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

Now, Cost of 8 ball pens $ = Rs.56$

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

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

Now, take the ratio of cost of a pen to the cost of a ball pen.

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

So, the ratio of the cost of a pen to the cost of a ball pen is 15:7

Note:Whenever we face such types of problems we use some important points. First we find the value of a single unit by using a unitary method then after the take ratio we can get the required answer.

Complete step-by-step answer:

Now use the unitary method to find the value of a single unit.

Cost of a dozen pens (12 pens) \[ = Rs.180\]

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

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

Now, Cost of 8 ball pens $ = Rs.56$

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

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

Now, take the ratio of cost of a pen to the cost of a ball pen.

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

So, the ratio of the cost of a pen to the cost of a ball pen is 15:7

Note:Whenever we face such types of problems we use some important points. First we find the value of a single unit by using a unitary method then after the take ratio we can get the required answer.

Recently Updated Pages

How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE

Why Are Noble Gases NonReactive class 11 chemistry CBSE

Let X and Y be the sets of all positive divisors of class 11 maths CBSE

Let x and y be 2 real numbers which satisfy the equations class 11 maths CBSE

Let x 4log 2sqrt 9k 1 + 7 and y dfrac132log 2sqrt5 class 11 maths CBSE

Let x22ax+b20 and x22bx+a20 be two equations Then the class 11 maths CBSE

Trending doubts

Guru Purnima speech in English in 100 words class 7 english CBSE

Which are the Top 10 Largest Countries of the World?

Fill the blanks with the suitable prepositions 1 The class 9 english CBSE

Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE

Change the following sentences into negative and interrogative class 10 english CBSE

Give 10 examples for herbs , shrubs , climbers , creepers

Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE

The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths

Select the word that is correctly spelled a Twelveth class 10 english CBSE