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Title: Surely the answer is 5.5
Review: The question asks "How many horses did the owner SELL", not how many did he get rid of.Assuming (although not stated) that he ended up with no horses left:To the first purchaser, he SOLD 3.5 and GAVE AWAY 0.5.To the second, he SOLD 1.5 and GAVE AWAY 0.5.To the third, he SOLD 0.5 and GAVE AWAY 0.5.So the total number of horses he SOLD is 3.5 + 1.5 + 0.5 = 5.5
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