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30-11-2018
Mathematics

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A textbook store sold a combined total of 465 psychology and physics textbooks in a week. The number of psychology textbooks sold was two times the number of physics textbooks sold. How many textbooks of each type were sold?

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30-11-2018

You should make
465^3=155
That mean that you should put 155+155=310 for the number of psychology textbook
And the number of physics textbook is 155

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