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SAT, 28.10.2020 19:00 claytonhopkins

Mario receieved y text messages each minute for 10 minutes yesterday and received t text messages each minute for 20 minutes today. What is the total number of text messages he received for two days in terms of y and t? A) 30yt B) 200yt C)20y + 10t D) 10y + 20t

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