Answer:
C) 160
Step-by-step explanation:
Set up a proportion:
= 
Cross multiply and solve for x:
15x = 3600
x = 240
This means in 400 marbles, 240 are purple.
To find how many are not purple, subtract 240 from 400:
400 - 240
= 160 marbles
So, 160 marbles are not purple
-6 + [4 - (x - 2)] = -6 + (4 - x + 2) = -6 + (6 - x) = -6 + 6 - x = -x
The equation is m-2, which is the number of magazines your friend has. Hope this helps!!!

hope the answer will helpful....