Question

Cost of 5 pencils is ₹10. find the cost of 20 pencils​

Answer 1

As per question,

We have to determine the cost of 20 pencils.

From the question,

It is given that,

Cost of 5 pencil is Rs. 10.

So, for finding the cost of 20 same pencil, we will first determine the cost of 1 pencil and then multiply it by 20.

So, determining the cost of 1 pencil.

We will divide the cost of 5 pencil by 5.

So, we will get,

The cost of 1 pencil will be $=\frac{10}{5} = Rs.\:2$

So, cost of 5 pencil will be $(Rs.\:2\times 20) = Rs.\:40$

Hence, cost of 20 such pencil will be Rs. 40.

Answer 2

• As per the data given in the question, we have to determine the cost of $20$ pencils.

       Given data:- The cost price of $5\ pencils$ is $rs10.$

       To find:- The cost price of $20$ pencils.

       Solution:-

• For calculating the cost price of $20$ pencils , firstly we have to calculate single pencils price.

       The cost of single unit of pencil is

          $=\frac{10}{5}\\=2rs.$

      So, the cost price of $20$ pencils will be

         $=20\times2\\=40rs.$

    Hence, the cost price of $20$ pencils will be $40rs.$