GWD31-6 数学一题求助！！！

dolorez

Q34:
One gram of a certain health food contains 7 percent of the minimum daily requirement of vitamin E and 3 percent of the minimum daily requirement of vitamin A.  If vitamins E and A are to be obtained from no other source, approximately how many grams of the health food must be eaten daily to provide at least the minimum daily requirement of both vitamins?

A.      3
B.      7
C.    10
D.    14
E.    33

sayysong

E么？
1/(3%) ，算起来还该取34才对吧？答案只有33。

nut7910

问题是要求选最接近的值，而不是精确值

sayysong

哦，看漏了，approximately，那就是E了。

dolorez

GWD31-3 三道数学！求助~~~~~~

Q10:  第二个为什么可以呢？
If $1,000 will be deposited in a bank account and I is the dollar amount of interest earned from the original deposit, represented as I = 1000 {(1 + r/100)n – 1}, and the annual interest rate is r percent, is r > 8 percent?
(1)    The deposit earns a total of $210 in interest in the first 2 years.
(2)    (1 + r/100)2 > 1.15

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.

Q29:（2）中是什么意思呢？？
Is the integer n odd?    
(1)      n is divisible by 3.
(2)      2n is divisible by twice as many positive integers as n.
   
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.

Q32:   为什么答案是D呢？？（2）中one  of numbers又不一定是中位数啊
A certain list consists of 3 different numbers.  Does the median of the 3 numbers equal the average (arithmetic mean) of the 3 numbers?
(1)    The range of the 3 numbers is equal to twice the difference between the greatest number and the median.
(2)      The sum of the 3 numbers is equal to 3 times one of the numbers.
   
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.