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Sonia, Let's suppose a person has some 5 cent coins and some 10 cent coins, with a total of 27 coins in all. There are several pieces of information. The way to set up problems like this is to find ways to calculate the values that you are given in terms The amount of money on hand is 5 x (number of 5 cent coins) + 10 x (number of 10 cent coins). The total number of coins is (number of 5 cent coins) + (number of 10 cent coins). If we use n as shorthand for (number of 5 cent coins), and d as shorthand for (number of 10 cent coins), 5n + 10d = 155 The solution is d = 4 and n = 23. Good luck!  


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