Question

If the cost of 12 pens is rupees 18 , find the cost of 30 pens
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Answer 1

Step-by-step explanation:

this is the answer !hope it helps ..

Answer 2

Given :

• Cost of 12 pens = Rs. 18

To Find :

• Cost of 30 pens = ?

Solution :

We are given :

Cost of 12 pens = Rs. 18

Now,

$\sf Cost \: of \: 1 \: pen = \dfrac{Total \: cost \: of \: pens}{Total \: no. \: of \: pens}$

By substituting the values :

$\sf : \implies Cost \: of \: 1 \: pen = \dfrac{Rs. \: 18}{12}$

$\sf : \implies Cost \: of \: 1 \: pen = Rs. \: 1.5$

Now, we have to find cost of 20 pens :

Cost of of 30 pens = cost of 1 pen × 30

By filling values :

$\sf : \implies Cost \: of \: 30 \: pen = Rs. \: 1.5\times 30$

$\sf : \implies Cost \: of \: 30 \: pen = Rs. \: 45$

Hence, cost of 30 pens is Rs. 45