A textbook store sold a combined total 402 of psychology and math textbooks in a week. The number of psychology textbooks sold was two times the number of math textbooks sold. How many textbooks of each type were sold?

Answer:The number of textbooks of each type were sold is 134 math and 268 psychology books.Step-by-step explanation:Given:Total number of math and psychology textbooks sold in a week is 402.Now, let the number of math textbooks sold be [tex]x[/tex].And, the number of psychology textbooks be [tex]2x[/tex].According to question:[tex]x+2x=402[/tex][tex]3x=402[/tex]Dividing both sides by 3 we get:[tex]x=134[/tex]So, total number of math textbooks were 134 .And, total number of psychology textbooks were [tex]2x=2\times 134[/tex]                                                                                  [tex]=268[/tex].Therefore, the number of textbooks of each type were sold is 134 math and 268 psychology books.