In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 16th board counting from the bottom of the stack. How many boards are in the stack?
A. 38 B.36 C.35 D.34 E.32
请会做这道题的同学帮帮我, 我不知道从哪里入手分析它
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