math
posted by Jayda .
Two fifths of the students in a class of 1200 own pc,s, how many students do not own pc's.
2/5 x 1200=480
1200480=720 is this correct?
30% of the students who own pc's also own play stations, what fraction of the students in the school own play station?
How do i work out this part?

Yes, your first answer is correct.
30% of 480 = 0.3 * 480 = 144 students own play stations and pcs.
144/1200 = 12/100 = 3/25