Age Relations

Age Relations – Verified PYQ Authority Guide

Age Relations is treated here as a focused concept hub. The aim is to show exactly how this concept appears across verified PYQs, which formulas or relationships recur in the solved corpus, and which nearby concepts deserve revision next. Every factual learning cue below is drawn from the existing verified, published and approved English PYQ corpus or from its Knowledge Graph relationships; the hub does not invent unsupported technical claims.

PYQ evidence snapshot

98 verified PYQs are currently mapped to this Concept hub. The represented years include 2025. Exam coverage currently includes RRB NTPC Under Graduate Level. Subject context includes Quantitative Aptitude. These values come from live mappings and can expand automatically when new verified PYQs are added.

Most useful verified PYQs to solve first

Start with the actual questions rather than memorising a generic note. The links below are ranked from the mapped corpus using repeat history and editorial quality, while the complete explanation stays on the individual question page.

1. Two sisters, Anika and Riya, have a combined present age of 34 years. Five years ago from now, Anika was twice as old as Riya was then. What is Anika's current age…
   RRB NTPC Under Graduate Level · 2025
   Use the standard Age Relations method and simplify; the result matches 21.
2. The radius of a spherical balloon is increased by 20%. Find the percentage increase in its surface area.
   RRB NTPC Under Graduate Level · 2025
   Use the standard Age Relations method and simplify; the result matches 44%.
3. When the cost of an article was decreased by 7%, the number of articles sold was increased by 20%. What was the effect (in percentage) on the revenue?
   RRB NTPC Under Graduate Level · 2025
   Use the standard Age Relations method and simplify; the result matches increase of 11.6%.
4. 20 note books, 100 pens and 50 pencils were bought for ₹3,500. If the average cost of a note book is ₹50 and that of a pencil is ₹10, find the average…
   RRB NTPC Under Graduate Level · 2025
   Use the standard Age Relations method and simplify; the result matches ₹20.
5. A company has three branches. Branch A has 40 employees with average monthly sales of ₹1,20,000, Branch B has 30 employees with average monthly sales of ₹1,80,000, and Branch C has 30…
   RRB NTPC Under Graduate Level · 2025
   Use the standard Age Relations method and simplify; the result matches 1,47,000.
6. Eight years ago, the age of Mr Gupta was four times that of his nephew, Rohit. After 6 years, Mr Gupta’s age will be twice that of Rohit. Find the present age…
   RRB NTPC Under Graduate Level · 2025
   Use the standard Age Relations method and simplify; the result matches 36 years.
7. The following data represents the weekly wages (in ₹) of the employees Find the arithmetic mean of the weekly wages (in ₹). Weekly wages (in ₹) 900 1000 1100 1200 1300 1400…
   RRB NTPC Under Graduate Level · 2025
   Use the standard Age Relations method and simplify; the result matches ₹1204.44.
8. S's expenditure is double the difference between his savings and expenditure. What percentage of his salary is his expenditure?
   RRB NTPC Under Graduate Level · 2025
   Use the standard Age Relations method and simplify; the result matches 40%.

Formula & key-relationship bank from verified solutions

• Percentage = (Part / Whole) × 100
• Average = Sum of observations / Number of observations
• Weighted Average = Σ(wx) / Σw

Use these as revision triggers and open the linked PYQ before applying a formula numerically; variable definitions and assumptions belong to the exact solved question.

Core ideas repeatedly reinforced by the solved corpus

• Use the standard Age Relations method and simplify; the result matches 21.
• Use the standard Age Relations method and simplify; the result matches 44%.
• Use the standard Age Relations method and simplify; the result matches increase of 11.6%.
• Use the standard Age Relations method and simplify; the result matches ₹20.
• Use the standard Age Relations method and simplify; the result matches 1,47,000.

Exam tips already validated in SRO solutions

• Identify the Age Relations relationship before calculation and keep units/bases consistent.

Common mistakes to avoid

• Using a shortcut without checking its conditions or using the wrong base/unit.

Topic and concept coverage

Mapped topic labels include Problems on Ages. The concept trail includes Age Relations. Use these labels as a revision map: move from the broad area to the narrow concept, solve a verified PYQ, inspect the detailed reasoning, and then attempt another question from the same cluster.

Knowledge Graph navigation

Continue with Age Problems, Problems on Ages, Arithmetic, Quantitative Aptitude. These are canonical SRO entity links based on the Knowledge Graph and shared question mappings, not keyword-stuffed tag pages.

How to revise this authority page efficiently

1. Solve before reading: answer a mapped PYQ first.
2. Read the exact explanation: verify the correct principle, formula, distractor logic and common mistake on that question page.
3. Move one level in the graph: use the closest concept/sub-topic/topic link rather than opening unrelated content.
4. Reattempt: solve another verified PYQ from this hub and check whether the same error repeats.

Quality scope: this page is automatically maintained from SRO’s verified mapped corpus. It enriches one canonical authority URL instead of generating multiple near-duplicate pages for keyword variants. Manual authority articles are never overwritten by the automated engine.