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gwd-22-32

 

Number Studying

Number Not

Total

 

Biology

Studying Biology

 

Number

 

 

18

of Boys

 

 

 

Number

 

 

 

of Girls

 

 

 

Total

26

 

 

 

 

The table above shows the number of students in a certain high school class who are boys and the number of students in the class who are studying biology.  What is the total number of students in the class?

(1)     Of the boys in the class, 15 are studying biology.

(2)   The number of girls in the class is twice the number of students in the class who are not studying biology.

                  

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.

Answer:

答案是b,可我怎么觉得是c啊,大家帮忙看看

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 算出來囉

設Number Not Studying Biology = X

Number of Girls就會 = 2X

26+X = 18 + 2X

算出 X = 8

26 + 8 = 34 (全班人數)

TOP

同意B

条件(2)的意思是女仔人数是不学习生物学的人数的2倍,而不是“女仔人数是不学习生物学的女仔人数的2倍

TOP

我也算出C耶

請問答案B是怎麼算的

請指教,謝謝.

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