Start learning →

Three of these are wrong. Find the one that holds.

Exercise and reference answers

Questions
  1. Question
    Three of these statements about direct proportion are false.
    Choices
    1. Item
      The ratio x/y stays constant
      Correct
      Yes
    2. Explanation
      That defines INVERSE proportion.
      Item
      The product xy stays constant
    3. Explanation
      In direct proportion they move together.
      Item
      One quantity falls as the other rises
    4. Explanation
      More workers means LESS time, so that is inverse.
      Item
      It applies to workers and time
  2. Question
    Three of these statements about inverse proportion are false.
    Choices
    1. Item
      The product xy stays constant
      Correct
      Yes
    2. Explanation
      That defines DIRECT proportion.
      Item
      The ratio x/y stays constant
    3. Explanation
      One rises while the other falls.
      Item
      Both quantities rise together
    4. Explanation
      Buying more costs more, so that is direct.
      Item
      It applies to quantity and cost

Explanation

Each trap swaps the two kinds of variation. Source: syllabus Maths, Ch 11 Direct and Inverse Proportions.
Continue learning with Quill →

Browse more AFCAT questions and exercises →