求教GWD数学部分题目

tracychou114

Q14:
If 10⁵⁰ – 74 is written as an integer in base 10 notation, what is the sum of the digits in that integer?


A.424
B.433
C.440
D.449
E.467
未读懂题目 答案选C

Q4:
If n is the product of the integers from1 to 20 inclusive, what is the greatest integer k for which 2^k is a factor of n?


A.10
B.12
C.15
D.18
E.20
答案选D 不懂


Q25:
A photographerwill arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row.The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her.How many such arrangements of the 6 people are possible?


A.5
B.6
C.9
D.24
E.36

答案选择A 想不通

Q29:
June 25, 1982, fell on a Friday.On which day of the week did June 25, 1987, fall?(Note: 1984 was a leap year.)


A.Sunday
B.Monday
C.Tuesday
D.Wednesday
E.Thursday
关于日期的题目，不是很熟悉，大N们 有什么规律吗？

What is the median number of employees assigned per project for the projects at Company Z?
(1)25 percent of the projects at Company Z have 4 or more employees assigned to each project.
(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
答案选C，中数的题目需要怎样的规律呢？
麻烦各位帮忙了


Q4:
If n is the product of the integers from1 to 20 inclusive, what is the greatest integer k for which 2^k is a factor of n?


A.10
B.12
C.15
D.18
E.20
答案选D 不懂


Q25:
A photographerwill arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row.The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her.How many such arrangements of the 6 people are possible?


A.5
B.6
C.9
D.24
E.36

答案选择A 想不通

Q29:
June 25, 1982, fell on a Friday.On which day of the week did June 25, 1987, fall?(Note: 1984 was a leap year.)


A.Sunday
B.Monday
C.Tuesday
D.Wednesday
E.Thursday
关于日期的题目，不是很熟悉，大N们 有什么规律吗？

What is the median number of employees assigned per project for the projects at Company Z?
(1)25 percent of the projects at Company Z have 4 or more employees assigned to each project.
(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
答案选C，中数的题目需要怎样的规律呢？
麻烦各位帮忙了

tracychou114

第一题懂了。。。但是第四题还是。。不是很明白 不知道怎么想。。

wang81675250

从1-20每一个数分解看含有几个2.
所以2,  2*2 ,2*3, 2*2*2, 2*5, 2*2*3, 2*7 ,2*2*2*2 ,2*9 ,2*2*5
共有18个2，因此为2的18次方
D

anthany

Q29， 因为一年有365天，365除以7 余1，也就是说 假设今天是星期N明年的今天就是 星期N+1,因为中间有一个leap year 那么就是 1+1+2+1+1=6 往后推6天 就是星期星期4

anthany

What is the median number of employees assigned per project for the projects at Company Z?
(1)25 percent of the projects at Company Z have 4 or more employees assigned to each project.
(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.


这道题， 25%的计划有4个或以上的 employee ， 35%的计划有2 个 或以下的人 ， 那么 必然40%的计划是只有3个emplyee 中位数必然是3 所以选c

anthany

Q14， 给你举例 ，10^3-74=926， 10^4-74=9926，看出规律了吧， 那么 10^50-74 的各位数字相加就应该等于 9*（50-2）+2+6=440