Question

49. The cost of 1 dozen pencils
is Rs. 60 . Find the cost of 18
pencils.​

Answer 1

Given :

• The cost of 1 dozen pencil is Rs.60.

Have to Find :

• Find the cost of 18 pencils.

Solution :

As we know that 1 dozen = 12 units.

Therefore,

• 12 pencil cost Rs.60

Let's find out the cost of one pencil .

$\implies$One pencil cost → 60/12

$\implies$One pencil cost → 5 Rs.

Now, Finding the cost of 18 pencils.

For 18 pencil cost → 18 × 5

⠀⠀$\underline{\bf{= 90 Rs}}$ ⠀

Hence, The cost of 18 pencils → 90 Rs.

____________________________

Answer 2

Given :

The cost of 1 dozen pencil is Rs.60.

Have to Find :

Find the cost of 18 pencils.

Solution :

As we know that 1 dozen = 12 units.

Therefore,

12 pencil cost Rs.60

Let's find out the cost of one pencil .

⟹ One pencil cost → 60/12

⟹ One pencil cost → 5 Rs.

Now, Finding the cost of 18 pencils.

For 18 pencil cost → 18 × 5

= 90Rs

⠀

Hence, The cost of 18 pencils → 90 Rs.

____________________________