How to do this
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https://www.meritnation.com/ask-answer/question/15-stamps-of-equal-value-cost-rs-18-how-many-stamps-of-the/direct-and-inverse-proportions/8977387
Here is the link for similar answer to your query :
https://www.meritnation.com/ask-answer/question/15-stamps-of-equal-value-cost-rs-18-how-many-stamps-of-the/direct-and-inverse-proportions/8977387