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Order the steps: solve a direct proportion problem

Exercise and reference answers

Steps
  1. Confirm the two quantities rise and fall together
  2. Write the first pair as a ratio
  3. Write the second pair as a ratio, with the unknown in place
  4. Set the two ratios equal to each other
  5. Cross multiply and solve for the unknown

Explanation

Set the two ratios equal and solve. Source: syllabus Maths, Ch 11 Direct and Inverse Proportions.
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