A textbook store sold a combined total of 423 math and psychology textbooks in a week. The number of math textbooks sold was 45 more than the number of psychology textbooks sold. How many textbooks of each type were sold?
[tex]423 = p + (p + 45)[/tex] [tex]423 = p + p + 45[/tex] [tex]423 = 2p + 45[/tex] [tex]423 - 45 = 2p[/tex] [tex]p = 378 \div 2[/tex] p represent psychology books if p is 189 then math books which is x is [tex]x = 189 + 45[/tex] [tex]x = 234[/tex]
