急切请教几道GWD的数学，请数学好的大侠们帮个忙。万分感谢啦

bbdolphin

1.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

 

 

2.To be eligible for retirement benefits at the Omega Corporation, the sum of an employee’s age, in years, and the number of years of employment must be at least 70.  If x, where x < 70, is a certain employee’s age when hired and y is the minimum number of years of employment required for the employee to be eligible for retirement benefits, which of the following equations represents the relationship between x and y ?

 

 

A.     xy = 70

B.     x + y = 70

C.     2x + y = 70

D.     x + 2y = 70

E.      2x + 2y = 70

这道题我怎么也不明白为什么答案给的是D，我选了B

3.During a 10-week summer vacation, was the average (arithmetic mean) number of books that Carolyn read per week greater than the average number of books that Jacob read per week?

(1)   Twice the average number of books that Carolyn read per week was greater than 5 less than twice the average number of books that Jacob read per week. 这个条件1应该怎样翻译？

(2)   During the last 5 weeks of the vacation, Carolyn read a total of 3 books more than Jacob.

4.  不明白B如何求得

Of the 32 students in a certain class, 15 are in a music club and 20 are in a dance club. If 10 of the students are not in either club, how many of the students are in only one of the two clubs?

A. 5   B. 9   C.10   D. 17   E. 25  

5.此题是什么意思呢？

The sides of a square region, measured to the nearest centimeters, are 6 centimeters long.  The least possible value of the actual area of the square region is

 

A.     36.00 sq cm

B.     35.00 sq cm

C.     33.75 sq cm

D.     30.25 sq cm

E.      25.00 sq cm

The sides of a square region, measured to the nearest centimeters, are 6 centimeters long.  The least possible value of the actual area of the square region is

 

A.     36.00 sq cm

B.     35.00 sq cm

C.     33.75 sq cm

D.     30.25 sq cm

E.      25.00 sq cm

bongrim

 

2.To be eligible for retirement benefits at the Omega Corporation, the sum of an employee’s age, in years, and the number of years of employment must be at least 70.  If x, where x < 70, is a certain employee’s age when hired and y is the minimum number of years of employment required for the employee to be eligible for retirement benefits, which of the following equations represents the relationship between x and y ?

A.     xy = 70

B.     x + y = 70

C.     2x + y = 70

D.     x + 2y = 70

E.      2x + 2y = 70

因为x是被录取时的年龄, 所以y 年之后是x+y岁.  所以选D

bongrim

3.During a 10-week summer vacation, was the average (arithmetic mean) number of books that Carolyn read per week greater than the average number of books that Jacob read per week?

(1)   Twice the average number of books that Carolyn read per week was greater than 5 less than twice the average number of books that Jacob read per week. 这个条件1应该怎样翻译？

(2)   During the last 5 weeks of the vacation, Carolyn read a total of 3 books more than Jacob.

我理解是  2C> 2J-5      答案是E吗?

bongrim

4.  不明白B如何求得

Of the 32 students in a certain class, 15 are in a music club and 20 are in a dance club. If 10 of the students are not in either club, how many of the students are in only one of the two clubs?

A. 5   B. 9   C.10   D. 17   E. 25

32-10=22   so 22 people are either in m or d.     ...   therefore the number of students in both m and d is  15+20-22=13

students in only one of the two clubs :  (15-13)+(20-13)=9

bongrim

5.此题是什么意思呢？

The sides of a square region, measured to the nearest centimeters, are 6 centimeters long.  The least possible value of the actual area of the square region is

A.     36.00 sq cm

B.     35.00 sq cm

C.     33.75 sq cm

D.     30.25 sq cm

E.      25.00 sq cm

答案是C 吗?

The sides of a square region, measured to the nearest centimeters, are 6 centimeters long.  The least possible value of the actual area of the square region is

A.     36.00 sq cm

B.     35.00 sq cm

C.     33.75 sq cm

D.     30.25 sq cm

E.      25.00 sq cm

答案是C 吗?

bbdolphin

    第五题是C，可是怎么得出的答案呢，请指点

kaikai23

最后一题答案是E，round to the nearest so that means the side should fall in the range of (5.5,6.5)

So that's clear, 5 is not in the range. All other choices' square roots fall in this range.

fennyhx

1.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

答案是D, 47*9+26

不知道是不是？

答案是D, 47*9+26

不知道是不是？