AMC8 1995

AMC8 1995 · Q17

AMC8 1995 · Q17. It mainly tests Percent, Arithmetic misc.

The table below gives the percent of students in each grade at Annville and Cleona elementary schools: Annville has 100 students and Cleona has 200 students. In the two schools combined, what percent of the students are in grade 6?

下表给出了Annville和Cleona小学各年级学生所占百分比： Annville有100名学生，Cleona有200名学生。在两所学校合计中，六年级学生占总学生的百分之多少？

(A) 12% 12%

(B) 13% 13%

(D) 15% 15%

(E) 28% 28%

Answer

Correct choice: (D)

正确答案：（D）

Solution

Answer (D): In Annville 11% of 100, or 11 students are in the 6th grade. In Cleona 17% of 200, or 34 students are in the 6th grade. Thus in the two schools combined, 45 out of 300 students are in the 6th grade, so 45/300 = 0.15 = 15% of all the students are in the 6th grade.

答案（D）：在安维尔（Annville），100人的11%为11人，读六年级。在克里奥纳（Cleona），200人的17%为34人，读六年级。因此两所学校合计，300名学生中有45名是六年级，所以 $45/300=0.15=15\%$，即所有学生中有15%是六年级。

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