[計量] GWD17

[sandisk (.)]

共有六題想請教

1. Can a certain rectangular sheet of glass be positioned on a rectangular
tabletop so that it covers the entire tabletop and its edges are parallel to
the edges of the tabletop?
(1)       The tabletop is 36 inches wide by 60 inches long.
(2)       The area of one side of the sheet of glass is 2,400 square inches.

Ans: E


2. Was the average (arithmetic mean) weight of the package mailed at a certain
post office yesterday greater than 600 grams?
(1)     The total weight of the packages mailed at the post office yesterday was
greater than 14,500 grams.
(2)       Fewer than 25 packages were mailed at the post office yesterday.

Ans: C

Fewer than 25 是有包含25嗎??


3. Juan bought some paperback books that cost $8 each and some hardcover books
that cost $25 each.  If Juan bought more than 10 paperback books, how many
hardcover books did he buy?
(1)       The total cost of the hardcover books that Juan bought was at least
$150.
(2)       The total cost of all the books that Juan bought was less than $260.

Ans: C

我怎麼算都覺得paperback books的數量不一定


4. For any integers x and y, min(x, y) and max(x, y) denote the minimum and the
maximum of x and y, respectively.  For example, min(5, 2) = 2 and max(5, 2) =
5.  For the integer w, what is the value of min(10, w) ?
(1)       w = max(20, z) for some integer z.
(2)       w = max(10, w)

Ans: D

想問第一項為什麼也可以??


5. Harvey teaches a certain number of biology students in 2 classes, K and L.
 He can divide the students in class K into 7 groups of n students each.  He
can divide the students in class L into 6 groups of p students each with 1
student left over.  How many students are in class L ?
(1)       n = p
(2)       There are 5 more students in class K than in class L.

Ans: C

我覺得第一個就可以單獨成立了=> 7P=6P+1 => P=1


6. If the range of the six numbers 4, 3, 14, 7, 10, and x is 12, what is the
difference between the greatest possible value of x and least possible value
of x ?

A.  0
B.  2
C. 12
D. 13
E. 15

Ans: D

range是12的話 x 不就是15嗎??



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◆ From: 218.173.14.192
推 Jerryerica:6.他問的是最大可能值和最小可能值range: 15-2=13 (D)
→ Jerryerica:3.paperback books的數量不一定==>沒錯,可是題目問你
→ Jerryerica:hardcover books =>這個可以確定就好 所以答案 (C)
推 Jerryerica:4. 因為 w = max(20, z)  所以w=20 or w=z>20
→ Jerryerica:不管哪個解帶回到min(10, w) 最小值一定是10
推 Jerryerica:5.題目沒有說K班級人數和L班級人數相等,所以要用到條件
→ Jerryerica:(2)==> 7n-(6p+1)=5 及n=p 才可以求解
→ Jerryerica:2.應該是沒有,所以兩個條件才可以求解
推 Jerryerica:1.題目是問玻璃可以蓋個長方形桌子嗎? 知道桌子長寬,
→ Jerryerica:可是玻璃只知道面積2400,可能可以40x60 但也有可能不行
→ Jerryerica:20x120 所以(E)