Question 682064
 Android,...........x 
 Blackberry,........y
 and iphone.--------z



The total number of phones is 195.
x+y+z=195..................(1) 
- The total value is $88225. The value of each phone is $195 for an Android, $150 for a Blackberry, 
and $595 for an iphone

195x+150y+595z=88225.............(2)

- The number of iphones equals twice the number of Android phones and 
twice the number of Blackberry phones combined.

z=2x+2y
2x+2y-z=0.....................(3)

solve for x y & z

You will get 25, 40,130 phones respectively.

m.ananth@hotmail.com