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Mathematics, 05.05.2020 09:41 ernestinebell3514

Mr. Beckett can scream at a rate of 120 words per minute when he is in a good mood and he can scream at a rate of 150 words per minute when he is angry. Yesterday he was screamed 3120 words for a total of 23 minutes. For how many minutes was Mr. Beckett angry? This thing is systems of equations I need help with making the equation

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Mr. Beckett can scream at a rate of 120 words per minute when he is in a good mood and he can scream...
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