Let:
x = Chemistry textbooks sold
y = Physics textbooks sold
The textbook store sold a combined total of 260, so:

The number of chemistry books sold was three times the number of physics textbooks sold, so:

Let:

Replace (2) into (1):

Replace the value of y into (2):
Answer:
8
Step-by-step explanation:
36/9=4
12-4=8
8 is your answer
Answer: Sorry
Step-by-step explanation: What table? I would love to help you but I need to see the table you are talking about. :(