Ratio and Proportion — SSC GD Study Notes

Overview

Ratio and Proportion is a high-yield topic in SSC GD Elementary Mathematics. It appears directly in 2–3 questions per paper and forms the foundation for Profit-Loss, Time-Work, Mixture-Alligation and Partnership problems. Candidates often lose marks here not because the concepts are difficult, but because they rush through ratio simplification or skip unit checks.

Mastering this topic means understanding three core ideas: what ratios represent (comparison between quantities), how proportions work (equality of two ratios), and how compound ratios and partnership splits extend basic ratio logic. SSC GD expects you to solve these problems in under a minute, so fluency with the standard methods—unitary method, cross-multiplication, and ratio-share formula—is essential.

For SSC GD, problems are straightforward if you know the formula and practice mental arithmetic. The exam does not ask complex multi-step ratio chains; instead, it tests whether you can quickly spot the ratio relationship, set up the equation correctly, and calculate the answer without arithmetic mistakes.

Key Concepts

• **Ratio** is the comparison of two quantities of the same kind, written as a:b or a/b. A ratio of 3:5 means the first quantity is 3 parts and the second is 5 parts out of a total of 8 parts.