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A35386. A group of children riding on bicycles and tricycles rode past Uncle Ben's house. The son of Uncle Ben counted 7 children and 19 wheels. How many tricycles were there( )。

单选题 中等

题目描述

A group of children riding on bicycles and tricycles rode past Uncle Ben's house. The son of Uncle Ben counted 7 children and 19 wheels. How many tricycles were there(    )。

选项(单选)

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