Question

the cost of five pens is 30 rupees find the cost of 12 pens​

Answer 1

Cost of five pens=30.

Therefore cost of 1 pen=30/5=6 rupees.

Therefore,

cost of 12 pens=12×6=rupees 72.

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Answer 2

Given :

Cost of 5 pens = ₹30

To Find :

The cost of 12 pens

Solution :

Using the unitary method ,

Finding the cost of 1 pen :

Cost of 5 pens = 30

Cost of 1 pen = 30/5 = 6

Cost of 12 pens = 12 × Cost of 1 pen

= 12 × ₹6 = ₹72

The required cost of 12 pens = ₹72