To find the number of students in Mrs. Harmon's class of 30 students who get to school by each mode of transportation, we can calculate the percentages of students for each category:
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Students who get to school by bus: \[ 70% \text{ of } 30 = 0.70 \times 30 = 21 \text{ students} \]
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Students who get to school by car: \[ 20% \text{ of } 30 = 0.20 \times 30 = 6 \text{ students} \]
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Students who walk to school: \[ 10% \text{ of } 30 = 0.10 \times 30 = 3 \text{ students} \]
So, in Mrs. Harmon's class of 30 students:
- 21 students ride the bus
- 6 students come to school by car
- 3 students walk to school