Question

if the cost of 15 pens each of the same value, is ₹300 the cost of 20 pens =​

Answer 1

Answer:

cost of 15 pens =300

cost of 1 pen = 300/15

= 20

cost of 20 pens = 20 × 20

rs 400

Step-by-step explanation:

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Answer 2

Answer:

the cost of 20 pens is 400 rs .

Step-by-step explanation:

As per question

we have given

the cost of 15 pens is ₹ 300 {each of the same value }

We have to find

the cost of 20 pens

now ,

The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value.

The word unitary refers to a single or an individual unit. Hence this method aims at determining values in relation to a single unit

cost of 15 pens =300 rs

cost of 1 pen = 300 / 15 rs

cost of 1 pen = 20 rs

cost of 20 pens = 20 × 20 rs

cost of 20 pens = rs 400

So , the cost of 20 pens is 400 rs .

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