Question: = 1 = 2 = 3 = 4 = 5 = 6 = 7 = 8 9 .= 10 A textbook store sold a combined

= 1 = 2 = 3 = 4 = 5 = 6 = 7 = 8 9 .= 10 A textbook store sold a combined total of 392 physics and psychology textbooks in a week. The number of physics textbooks sold was three times the number of psychology textbooks sold. How many textbooks of each type were sold? Number of physics textbooks sold: Number of psychology textbooks sold: X ? K

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