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Relation for Direct Proportion

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Question

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If the cost of 3 pens is Rs.18, then the cost of 5 pens is __________.

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Solution

Cost of 3 pens = Rs. 18
Cost of 1 pen = 18 $\div$ 3 = Rs 6
Cost of 5 pens = 6 $\times$ 5 = Rs. 30.

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