Answer:
120 history textbooks
360 physics textbooks
Explanation:
Physics textbooks = 3 times the amount of history textbooks
History textbooks = x
Physics textbooks = 3x
480 = x + 3x
= 4x
480/4 = x
x = 120
120 history books sold
480-120 = 360
360 physics textbooks sold
btw sorry if I didn't give enough working or help you understand it I'm not great at this kind of thing