15 postcards cost rupee 2.25 . What will be the cost of 24 postcards? How many postcards can we buy in rupees 45
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We will use UNITARY METHOD HERE,
Cost of 15 Postcards - Rs 2.25
Cost of 1 postcard - Rs 2.25/ 15
Cost of 24 postcards - Rs 2.25/15 ×24=Rs 3.6
Similarly,
In Rs 3.6 we can buy 1 postcard
In Rs 1 we can buy = 1/3.6
In Rs 45..... We can buy =1/3.6×45
= 12 postcards(approx.)
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