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A63352. A group of children riding on bicyclesand tricycles rode past Uncle Ben's house. The son of Uncle Ben counted 7children and 19 wheels. How many tricycles were there ( )

单选题

题目描述

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

选项(单选)