求助

水享

请大家帮忙解释几道数学题，详细点，多谢了

When positive integer x is divided by positive integer y, the remainder is 9.  If x/y = 96.12, what is the value of y?

A.    96
B.    75
C.    48
D.    25
E.    12
顺便问下x is divided by positive integer y是x/y还是y/x啊？ 这题答案是B

2。这题是GWD第二套里面的题目，有一个图，但是画不上来。。。就是一个半圆形的图，貌似是个隧道，而且图上半圆的直径标的是20ft。。
The figure above shows the dimensions of a semicircular cross section of a one-way tunnel.  The single traffic lane is 12 feet wide and is equidistant from the sides of the tunnel.  If vehicles must clear the top of the tunnel by at least ½ foot when they are inside the traffic lane, what should be the limit on the height of vehicles that are allowed to use the tunnel?

A.    5½ ft
B.    7½ ft
C.    8 ½ ft
D.    9½ ft
E.    10 ft
Answer: B

On a certain transatlantic crossing, 20 percent of a ship’s passengers held round-trip tickets and also took their cars abroad the ship.  If 60 percent of the passengers with round-trip tickets did not take their cars abroad the ship, what percent of the ship’s passengers held round-trip tickets?

A.    33 1/3%
B.    40%
C.    50%
D.    60%
E.    66 2/3%
答案C
这题怎么翻译啊？我就直接翻译成只有来回船票的人。。。然后就是60%的人只有来回票没有带车子。。

这题也是GWD第二套上的题目，有一个图，画不上来，这个图是一个一个椎体，底部是一个正方形。
In the figure, each side of square ABCD has length 1, the length of line segment CE is 1, and the length of line segment BE is equal to the length of line segment DE.  What is the area of the triangular region BCE?

A.    1/3
B.    (?2)/4
C.    1/2
D.    (?2)/2
E.    3/4
答案中正方形是根号。。答案选B