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Passage: Class A has a total number of students in group X. The ratio of the number of students in groups Y and Z is 1:2. Class B has a total of 80 students. The ratio of the number of students in groups X, Y, and Z is 8:5:3. In Class C, the number of students in group Y is half that in group X. The number of students in group X in Class C is 20 more than that in group X in Class A. The number of students in group Z in Class C is 20% less than that in group X of the same class. Question: What is the total number of students in group Y of all the classes?
- 95
- 70
- 120
- 80
Correct answer: 70
Solution
The table shows the number of students in group Y for classes A, B, and C as 20, 25, and 25 respectively. Adding them gives \(20+25+25=70\). Therefore, the total number of students in group Y across all classes is 70.
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