In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 17th board counting from the bottom of the stack. How many boards are in the stack?  Pick one:
A) 38	B) 36	C) 35	D) 34	E) 32
Counting from the top, after the 20th board, there are 15 boards left to count.   The answer is 35.
<result>C</result>
In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 17th board counting from the bottom of the stack. How many boards are in the stack?