JCERT · Class 8 · Chapter 10 · Direct and Inverse Proportions. Syllabus-aligned topic notes and teaching examples, not a complete textbook answer key.
JCERT · Class 8 · Chapter 10 · Direct and Inverse Proportions. Syllabus-aligned topic notes and teaching examples, not a complete textbook answer key.
JCERT · Regular schools (Non-SOE) · Class 8 · Chapter 10 — Direct and Inverse Proportions
Official syllabus pages 152–161. Official syllabus · Prescribed Hindi book (17 chapters).
These topic notes and teaching examples are not a complete answer key to every textbook exercise. English notes use this same JCERT chapter order; a matching English textbook PDF has not been verified.
In direct proportion, the ratioy/x is constant. In inverse proportion, the productxy is constant. Worker-time problems assume a fixed amount of work and the same constant productivity per worker.
More workers need less time, so this is inverse proportion.
6×10=15×t; t=4days
More workers need less time, so this is inverse proportion.
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