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OpenStudy (anonymous):
A textbook store sold a combined total of 270 history and biology textbooks in a week. The number of history textbooks sold was two times the number of biology textbooks sold. How many textbooks of each type were sold?
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OpenStudy (anonymous):
Well, the first thing you need is a Let statement. And the last thing is the total amount. How many things are being sold and what is the relation or ratio?
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