. Adam has a total of 40 coins. He has the same number of twenty-cent coins and one-dollar coins. Find the difference in value between the $1 coins and twenty-cent coins. 2. Adam has the same number of twenty-cent coins and one-dollar coins. The difference in value between all the twenty-cent coins and all the one-dollar coins is $7.20. How many coins does Adam have in all

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1. Adam has a total of 40 coins. He has the same number of twenty-cent coins and one-dollar coins. Find the difference in value between the $1 coins and twenty-cent coins. 2. Adam has the same number of twenty-cent coins and one-dollar coins. The difference in value between all the twenty-cent coins and all the one-dollar coins is $7.20. How many coins does Adam have in all? 3. Adam has three fewer one-dollar coins than ten-cent coins. The total value of the ten-cent coins is $7.80 less than the total value of the one-dollar coins. How many coins does Adam have in all?
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