42.一定要记清楚 times as many A as B 是什么意思
这题是说去野餐 多少人忘记了,很好做的一个数可能是40吧?there are three times adults as children, and there are twice as many women as men,问 有多少小孩?
times as many A as B 就是A=2B
there are three times adults as children A=3C
there are twice as many women as men W=2M
其中A=W+M
43.2个盒子的东西, 一个B 开头其中有B若干,一个C开头有C 若干, B 1美金, C 1.5 美金 ,问 每个C比B 贵 多少。
条件1 C 大于 15
条件2 C 比B 多2 个。
44. 一个人去吃饭 , bill was $ 20.8 including 4persent tips. He left 12persent to 16 percent tips. What was the probably tips has he left? 2个答案 比较有争议,2.45 3.35 有点不明白要不要加上 bill上的。
47.V1 问 13个数的中位数 是否得20?
条件1 6 numbers are less than or equal 20
条件2 6 numbers are more than or equal 20.
我选C 但觉得这题有点奇怪
V2 51个数,问你median 是否大于10?
1. 有26个数字大于10
2. 忘了
考古
nowwsy筒子给大家考古了一道类似但不一样的题
What is the median of a certain set of 7 numbers?
(1) 3 of the numbers are less than 10.
(2) 4 of the numbers are greater than 10.
【答案】E
【思路】求中位數前必須先知道各個數字的相對大小,
而7個數裡的中位數,是數列中第四大(或第四小)的數字。
(1) 沒給其他四個數的資訊。
(2) 沒給其他三個數的資訊。
(1)+(2) 注意不要誤選C了,結合(1)跟(2)只能得知中位數比10大的結論而已,確切數值仍然不知。
48.选取 two of the letters a,b,c and d and either 1 or2排列,可以重复但是不能分开 后面给了例子 (aa1, ab1 or 2ac)这样的 问排列有多少种可能?
我选 64 因为字母排列是可重复的所以 有4X4 种可能,然后再 X2 表示 选取 1或是2 ,再X2 表示排放在字母前面或是后面的可能最后是64。
95.有题是说each box of A costs $1, while each of B costs $1.5, does B costs more than A per mint ?
(1) B has more than 15 mints in the each box
(2) B has 2 more mints than A in each box. C作者: xiongbaobao 时间: 2010-5-28 17:35
96. 这题我没弄明白,the range of daily low temperature in June is 20 and 25 in July, what is the smallest range of the daily low temperature in the two month? 答案有 5, 20 , 25, 30 , 45
97. a rectangle coordinate, a circle inside, 问圆的周长?
1. 经过(2,0) 和(0,2) 2. 忘了
98. x+2y+3z=5 和 x +3y +5z=7 问x+y+z=? 3
99. 一个圆,X is the centure, XB is the radius, AC intersects with XB, the point of intersect is D, ADX=90度,DB=2, 半径多少?