Question:

There are 16 pens. There are 3 times as many red as blue pens. There are 4 more green pens than red. ?

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How many of each color are there?

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  1. That doesn't work. If there was 1 blue pen, there would have to be 3 red, and 7 green. That's 11 pens. If there were 2 blue pens, there would have to be 6 red, and 10 green. That's 18 pens. Unless there are half pens, it doesn't work.  

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