SiLi

3.        664-!-item-!-187;#058&000504
A certain taxi company charges $3.10 for the first [?] of a mile plus $0.40 for each additional   of a mile.  What would this company charge for a taxi ride that was 8 miles long?

(A) $15.60
(B) $16.00
(C) $17.50
(D) $18.70
(E) $19.10

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
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【答案】D
【思路】上面數下來第20個剛好在由下往上數第16個的下面→上面數下來第20個是下面數來第15個 （下面有14個,上面有19個,在加上中心點那一個 19+14+1＝34