If 256 enveloped letters were sent by truck, and 141 were sent by plane, how many more letters were sent by truck than plane? Readers answer this and other postal-related math problems.
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语言 英语 ● 格式 PDF ● 网页 16 ● ISBN 9781448841172 ● 出版者 The Rosen Publishing Group, Inc ● 发布时间 2009 ● 下载 3 时 ● 货币 EUR ● ID 8667790 ● 复制保护 Adobe DRM
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