To find the percentage of students who have dogs, we need to first determine how many students have dogs out of the total number of students in the middle school.
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Determine the total number of students:
- Number of 6th graders: 55
- Number of 8th graders: 85
- Total students = 55 + 85 = 140
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Identify the number of students who have dogs:
- According to the information provided, 35 students have dogs.
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Calculate the percentage of students who have dogs:
- The formula for calculating the percentage is: \[ \text{Percentage} = \left( \frac{\text{Number of students with dogs}}{\text{Total number of students}} \right) \times 100 \]
- Plugging in the numbers: \[ \text{Percentage} = \left( \frac{35}{140} \right) \times 100 \]
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Perform the division:
- \( \frac{35}{140} = 0.25 \)
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Convert to percentage:
- \( 0.25 \times 100 = 25% \)
Thus, the percentage of students who have dogs is 25%.