- Direct Variations
- Problem 1: Direct Variations
- Problem 2: Direct Variations
- Inverse Variations
- Problem 1: Inverse Variations
- Problem 2: Inverse Variations
- Problem 3: Inverse Variations

- K-Method and Theorem 1 on Proportion
- Problem 1: K-Method and Theorem 1 on Proportion
- K-Method and Theorem 2 on Proportion

- Law of Proportion
- Problem 1: Law of Proportion
- Duplicate Ratio
- Problem 1: Duplicate Ratio
- Invertendo Theorem
- Problem 1: Invertendo Theorem
- Alternando Theorem
- Problem 1: Alternando Theorem
- Componendo Theorem
- Problem 1: Componendo Theorem
- Dividendo Theorem
- Problem 1: Dividendo Theorem
- Componendo-Dividendo Theorem
- Transitive Property of Ratio
- Problem 1: Transitive Property of Ratio

- Word Problem of Ratio of Shadow & Height
- Problem 1: Word Problem of Ratio of Shadow & Height
- Word problem of Ratio between Two Numbers
- Problem 1: Word problem of Ratio between Two Numbers
- Word problem of Ratio of Sides of Polygons
- Problem 1: Word problem of Ratio of Sides of Polygons
- Word problem of Ratio of angles of Polygons
- Problem 1: Word problem of Ratio of angles of Polygons
- Word problem of Ratio of Income & Expenses