Mathematics, 10.03.2021 15:40, grettelyesenia

Mr. D'Alton made some radium in his lab. He used 2/5kg of the radium every time he ran his experiment. If he did the experiment four times and had 2 1/3 kg left, how much radium did Mr. D'Alton make at first?

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Mr. D'Alton made some radium in his lab. He used 2/5kg of the radium every time he ran his experimen...