There are 20 balls which are red, blue or green. If 7 balls are green and the sum of red balls and green balls is less than 13, at most how many red balls are there?. a ... 4 b ... 5 c ... 6 d ... 7.
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Home » Mathematics » There are 20 balls which are red, blue or green. If 7 balls are green and the sum of red balls and green balls is less than 13, at most how many red balls are there?. a ... 4 b ... 5 c ... 6 d ... 7.