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Introduction to Proportion Ratio & Proportion Video Lecture - General Test
FAQs on Introduction to Proportion: Ratio & Proportion
| 1. What's the difference between ratio and proportion, and why does it matter for GATE? |  |
Ans. A ratio compares two quantities using division (like 3:5), while proportion states that two ratios are equal (3:5 = 6:10). Understanding this distinction is crucial for GATE General Aptitude because proportion problems frequently test your ability to set up equivalent relationships and solve for unknowns using cross-multiplication and scaling concepts.
| 2. How do I solve problems where one quantity changes proportionally to another? | |
Ans. When quantities are directly proportional, use the formula y = kx, where k is the constant of proportionality. Identify the relationship between variables, find k using given values, then substitute to find unknowns. For inverse proportionality (y = k/x), remember that as one increases, the other decreases-a common GATE aptitude trap where students confuse direction.
| 3. Why do my ratio simplification answers not match the answer key? | |
Ans. Ratio simplification requires finding the greatest common divisor (GCD) of both terms. Many students skip fully reducing to lowest terms or forget that 12:8 simplifies to 3:2, not 6:4. Always divide both parts by their GCD to match standard forms that GATE uses in official solutions.
| 4. What's the fastest way to handle multi-step proportion problems in exams? | |
Ans. Break multi-step proportions into smaller chains: if a:b = 2:3 and b:c = 4:5, find the common term (b) first, then scale ratios to match. This chainable ratio method saves time compared to solving algebraically. Use EduRev's mind maps and visual worksheets to practise recognising ratio chains quickly under timed conditions.
| 5. When should I use direct proportion versus setting up an equation? | |
Ans. Use direct proportion when the relationship is explicitly stated or obvious (distance-time at constant speed). Set up equations for complex scenarios involving multiple constraints or non-linear relationships. For GATE's General Aptitude section, proportion formulas work faster, but recognising when to switch methods prevents calculation errors and saves critical exam minutes.
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Apr 18, 2026 Last updated
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