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Divya and Nandan go to a bakery and buy some black currant pastries. Divya buys 9 black currants more than Nandan. Later in the day, they go to the bakery again and buy some butter scotch pastries. In the entire day, Divya and Nandan buy a total of 12 and 21 pastries respectively but spend the same amount of money. Find the ratio of the price of a black current to that of a butter scotch.