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thereare60birdsinthetree.Afterawhile,47birdsflytothesecongtree.thenthereare20birdsineverytree.doyouknowhowmanybirdsareineverytreeatfirst?the1sttree:the2ndtree:the3rdtree:
题目内容：
there are 60 birds in the tree.After a while,47 birds fly to the secong tree.then there are 20 birds in every tree.do you know how many birds are in every tree at first?the 1st tree:the2nd tree:the 3rd tree:优质解答
there are 20 birds in every tree.20
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