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Xuan Yun has a total of 24 coins in her piggy bank. Some of them are twenty-cent coins and the others are fifty-cent coins. Thetotal savings is $6.90. How many twenty-cent and fifty-cent coins does she have?

  • maths -

    number of 25 cent coins --- x
    number of 50 cent coins ---- 24-x

    25x + 50(24-x) = 690

    solve for x and back-substitute

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