In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 15th board counting from the bottom of the stack. How many boards are in the stack? Choose the correct option.
A) 38 B) 36 C) 35 D) 34 E) 33
Counting from the top, after the 20th board, there are 13 boards left to count.   The answer is 33.
<result>E</result>
In a stack of boards at a lumber yard, the 20th board counting from the top of the stack is immediately below the 15th board counting from the bottom of the stack. How many boards are in the stack?