Mathematics, 20.10.2019 12:50, gibsonchristian96

Madame curie made some radium in her lab. she used 2/5 kg of the radium in an experiment and had 1 1/4 kg left. how much radium did she have at first?

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Madame curie made some radium in her lab. she used 2/5 kg of the radium in an experiment and had 1 1...