A recent national study of the public schools shows that there are now one microcomputer for every thirty-two pupils, four times as many than there were four years ago.
I am sorry but I personally disagree with the banzhu's opinion. I don't think it has anything to do with one microcomputer or two microcomputer. "Four times as many as there were" means there are 4 times as many pupils as there were. That's why it's there were instead of there was.
According to the paragraph, yes it is true. Wow the ratio is worse than that in the old days, which does not make "common" sense to us because we always assume that things are always getting better and this is where GMAT twists our brains.