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2014-10-14T21:35:47+05:30

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Let number of 10 rupees cards = x
           cost of 10 rupees card = 10x
       number of 5 rupees cards = 2x/3
            cost of 5 rupees card = 5(2x/3) = 10x/3
     number of 15 rupees cards = x/5
            cost of 10 rupees card = 15(x/5) = 3x

total cost = 10x + 10x/3 + 3x = (30x+10x+9x)/3 = 49x/3
thus 49x/3 = 245
⇒x = (245×3)/49 
⇒x = 15 (no. of 10 rupees card)
2x/3 = (2×15)/3 = 10 (no. of 5 rupees card)
x/5 = 15/5 = 3 (no of 15 rupees card)

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