It does not tell us; they could be either pro or con, according to your interpretation. I would read it, however, as half of the class being divided into further halves, pro and con, while the other half of the class pursued some other topic of debate.
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tinanam0102Half of the class debated keeping the blinds up.No. Only some of them wanted the blinds up. Others wanted the blinds down. They were making their views known to one another.
Does that mean they want the blinds up?
tinanam0102If this sentence were to read as "Half of the class argued that the blinds should be kept up". Is this sentence same as "Half of the class debated keeping the blinds up."?It's a little different.