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三年级数学，培优题，趣味题。学霸嗷嗷叫:找不到下手的地方！
三年级数学，培优题，趣味题。小王家有鸡、鸭50只。他卖出鸡的一半，又买回50只鸭，这时鸭的只数是鸡的3倍，小王家原有多少只鸡？
人教版三年级数学下册，典型题、易错题、培优题(与教材同步）43/95
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