Number here means count . An even number is divisible by 2. Ballroom dance classes do much better if there is an even number of boys and girls.
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YukoThere is an even number of boys and girls.Sorry, but this doesn't make sense to me. Thirteen boys and three girls makes an even number of boys and girls, and I don't think that was the intended meaning.
AlpheccaStarsIt should have been:"There is an equal number of boys and girls.Really? I would have said There are an equal number of boys and girls.