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Practice

Recognize a broken proportional model

A delivery cost includes USD 4 per box plus one fixed USD 30 dispatch fee. Which statement is correct?

Ratio direction map

Label both quantities before reducing to a per-one rate

  1. LabelQuantity A compared with B
  2. DirectChoose the requested per-unit direction
  3. ReduceDivide both parts consistently
  4. ScaleApply one factor to both parts
  5. CheckUnits and cross-products agree

Direction determines meaning. Preserve the numerator and denominator units, scale both parts together, and substitute the result to check the relationship.

Choose one answer