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Michelle has 20 coins in her purse. There are only 10 pence, 20 pence, and 50 pence and the total value of the money

Michelle has 20 coins in her purse. There are only 10 pence, 20 pence, and 50 pence and the total value of the money is 500 pence. If she have more 50 pence coins than 10 pence coins, how many 10 pence coins does she have?

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