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How Many Coins Are There?

There was a pile of dimes and nickels. Ryan picked 7 coins from the pile
and it was 50 . How many dimes and nickels did Ryan pick from the
pile?
Step 1. If all the coins were dimes, how many dimes did Ryan pick?

Step 2. If 1 dime is exchanged with 2 nickels, the total number of coins
increases by 1. Make 50 by using 7 coins.
5 coins

6 coins

7 coins

Step 3. How many dimes and nickels are used to make 50 ?
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