Ratio and proportion appears in the official SSC CGL Quantitative Aptitude syllabus as a single line, which badly undersells what it does for your score. Once you can read a question in ratios, partnership, mixture and alligation, time and work, and speed-distance stop being four separate chapters and start being one chapter wearing different clothes. That is why a shaky ratio foundation does not show up as 'I get ratio questions wrong' — it shows up as being slow everywhere in Quant. This page covers chain ratios, direct versus inverse proportion, the k-method, and real previous-year SSC questions to practise on.
'Ratio & Proportion' is listed by name in SSC's official Quantitative Aptitude syllabus, and the questions built on it live inside the 25-question Quant section of CGL Tier-1, where each question is worth 2 marks and each wrong answer costs 0.50. SSC does not publish how many ratio questions a paper will carry, and the count varies by shift, so the honest way to think about this topic is not as a question quota but as a method that appears inside other questions: partnership shares, alligation, efficiency in time and work, and inverse variation in speed and time are all ratio questions with different labels. Since the real Tier-1 gives 60 cumulative minutes across all four sections, the time ratio saves you elsewhere is worth more than the marks it earns directly.
When a question says A : B = 3 : 5, write A = 3k and B = 5k and let the rest of the question tell you what k is. It sounds trivial and it is the single habit that separates aspirants who finish ratio questions in 30 seconds from those who plug in numbers and hope. The practice sets here force the k-method on multi-variable questions where intuition stops working.
Given A : B = 2 : 3 and B : C = 4 : 5, the usual approach is to scale B to a common value and read off A : B : C = 8 : 12 : 15. Once there are three or four links in the chain, or the ratios are given in reverse order, this is where aspirants lose the thread. We drill the chaining pattern until the scaling step is mechanical, including the inverted-ratio versions SSC likes.
More workers means less time; more speed means less time; more men-days means more work. The decision of whether to multiply or divide is made in the first five seconds of reading, and getting it wrong means a confident, fully-worked, entirely wrong answer. This module trains the read, not just the computation, using phrasings taken from real SSC papers.
Our bank carries around 31,000 questions, of which roughly 29,000 are genuine previous-year SSC questions with the commission's own official answer keys from CGL, CHSL, MTS and other papers. Filtering to ratio and proportion lets you see how few distinct question shapes SSC actually uses, and the Quant AI tutor will walk through any step you get stuck on, in Hindi or English.
Yes. 'Ratio & Proportion' is named explicitly in the Quantitative Aptitude syllabus SSC publishes for CGL Tier-1, alongside Percentage, Averages, Interest, Partnership Business, and Mixture and Alligation. It also carries forward into the Tier-2 Mathematical Abilities module, which extends the Tier-1 arithmetic list rather than replacing it. So it is not an optional or 'sometimes asked' topic — it is on the commission's own list.
A ratio compares two quantities of the same kind, written a : b. A proportion is a statement that two ratios are equal, a : b = c : d, from which the cross-product rule ad = bc follows. A continued proportion means a : b = b : c, where b is the mean proportional and equals the square root of ac, and c is the third proportional to a and b. SSC asks directly for mean proportional, third proportional and fourth proportional, so knowing which name refers to which position saves you a re-read in the hall.
Make B the same in both ratios. B is 3 in the first and 4 in the second, so scale the first by 4 and the second by 3, giving A : B = 8 : 12 and B : C = 12 : 15, hence A : B : C = 8 : 12 : 15. For longer chains, multiply each ratio by the product of the other ratios' relevant terms rather than hunting for an LCM each time. With two or three practice sets this becomes something you do while still reading the question.
Ask yourself what happens to the second quantity if the first doubles. If it also doubles, it is direct and you multiply by the ratio as given; if it halves, it is inverse and you multiply by the ratio flipped. More workers finishing a fixed job means less time, so workers and time are inversely proportional; more hours worked at a fixed rate means more wages, so those are directly proportional. Deciding this deliberately before touching the numbers prevents the most common ratio mistake in SSC papers.
Substantially, and this is the main argument for spending real time on it. Partnership is profit split in the ratio of capital times time; alligation is a ratio of distances from a mean; in time and work, efficiency is inversely proportional to time taken; in speed-distance-time, speed and time vary inversely for a fixed distance. Aspirants who treat these as four unrelated formula sets end up memorising four times as much as those who see one idea. After your mock, the AI analysis tags mistakes by type, so if ratio reasoning is the common thread behind failures in several chapters, the 7-day plan it builds will point at that root cause rather than at the symptoms.
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