Question 1053327

There are a total of 1200 students at a school. The ratio of teacher to students 1:30.
How many teachers are there at the school?

Two fifths of the students own personal computers, how many students do not own personal computers?

Thirty percent of the students who own personal computers, also own play stations. What fraction of the students in the school own play stations? Express in lowest terms. 

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Thanks 
<pre>{{{highlight_green(matrix(1,2, 40, teachers))}}}, not 400. Ridiculous!!