NCERT · Class 8 · Mathematics · Direct and Inverse ProportionsWhich of the following represents a direct proportion?
Step-by-Step Solution
The number of articles purchased and their total cost are in direct proportion because as the number of articles increases, the total cost also increases proportionally.
Detailed Options Breakdown
Option : Speed of a vehicle and time taken to cover a fixed distance
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Direct and Inverse Proportions.
Option 1: Number of workers and time taken to complete a job
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Direct and Inverse Proportions.
Option 2: Number of articles purchased and their total cost (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 3: Population of a country and area of land per person
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Direct and Inverse Proportions.
💡 Study Guide: This question tests core syllabus concepts from Direct and Inverse Proportions. For formulas, key summaries, and mock exam reference guides, read the full Direct and Inverse Proportions Revision Notes.