Question

Aaradhya went to shop to buy pencils. If cost of 20 pencils is ₹100. how much did he pay for 7pencils?​

Answer 1

Answer:

20pencils=100

7pencils=

20:7::100:x

7*100/20

35

Answer 2

Given

• Cost of 20 Pencils = ₹100
• Cost of 7 Pencils?

Explanation:

❏ Here, Unitary method is used in which firstly we have to find the cost of the one item then after we can find the cost of required number of items.

Firstly, We have to find the cost of One such pencil as:-

20 Pencils = ₹ 100

Pencil = 100/20

1 Pencil = ₹ 5

Now, We can easily find the cost 7 such pencils that she bought as:-

$\colon\implies{\sf{ 1 \ Pencil = 5 }} \\ \\ \\ \colon\implies{\sf{ 7 \ Pencils = 7 \times 5 }} \\ \\ \\ \colon\implies{\sf\pink{ 7 \ Pencil = Rs. \ 35 }}$

Hence,

$\\ {\underline{\sf{ The \ cost \ of \ 7 \ such \ pencils \ is \ Rs. \ 35 }}}$