Question

the cost of 4 m of cloth is Rs 40. find the cost of 9 m of cloth​

Answer 1

Step-by-step explanation:

cost of 4 m cloth=Rs 40

cost of 1m cloth=40/4=Rs 10

cost of 9m cloth=9×10=Rs 90

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Answer 2

Concept

Unitary Method in mathematics is used to find the value of objects by first calculating the value of one object then multiplying the number of objects to the value of single object to get the necessary value.

Given

Cost of 4m cloth is Rs.40

Find

Cost of 9m of cloth

Solution

We know that cost of 4m of cloth is Rs. 40

Using unitary method

4m of cloth = 40

1m of cloth = 40/4

1m of cloth = 10

Calculating the value of 9m of cloth

9m of cloth = 9 * value of 1m of cloth

9m of cloth = 9 * 10

9m of cloth = 90

The cost of 9m of cloth is Rs. 90

 

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