GMATPrep T1-Q4-PS

由 **orange0828** » 2007-08-01 21:26

4. 765-!-item-!-187;#058&000550
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

我怎麼算都是35,答案是D
可能是我數學不太好,請各位高手指點一下,謝謝

由 **Frankts** » 2007-08-01 22:11

1 34
2 33
3 32
4 31
5 30
6 29
7 28
8 27
9 26
10 25
11 24
12 23
13 22
14 21
15 20
16 19
17 18
18 17
19 16
20 15
21 14
22 13
23 12
24 11
25 10
26 9
27 8
28 7
29 6
30 5
31 4
32 3
33 2
34 1
題目應該是這個意思所以好像是34個你看一下對不對