Answer:
all the above
Step-by-step explanation:
Don't take my word for it
The number of CDs in Walter’s collection = x
The number of CDs in Brian’s collection = 3x
The total number of CDs in both collections = 144
Then
x + 3x = 144
4x = 144
x = 36
From the above deduction, we can conclude that the correct option among all the options that are given in the question is the last option or option "J".
LCM I believe. Because it’s every 6 days he does both
(x,y)--->(-x,y) should be it
Xy=80 would be right because it would be x=80/y and y=80/x
