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Suppose a school's policy requires 15 chaperones for every 200 students on a field trip. How could a table of ratios be used to find the number of chaperones required for a field trip of 120 students?

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There will be 9 chaperones required for a field trip of 120 students.

Number of chaperones required for 200 students = 15

Firstly, we need to find the number of chaperone required for one student :

This could b e expressed thus :

  • 200 students = 15 chaperones
  • 1 student = y chaperones

Solve for y using cross multiplication

200y = 15

y = 15 / 200

y = 0.075

This means that 0.075 chaperone is required for one student.

The Number of chaperones required for 120 students will be ;

  • 0.075 × 120 = 9

Therefore, 9 chaperones are required for a field trip of 120 students.

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