Simple interest · solved example
Find the simple interest on Rs 2000 at 5% per annum for 3 years.
- 240
- 360
- 330
- 300Correct
- 270
Solution
SI = P×R×T/100 = 2000×5×3/100 = 300.
Railways | RRB Section Controller
RRB Section Controller sets 25 Mathematics questions for 25 marks in the Computer Based Test, so it is worth planning your preparation around the topics below.
The quantitative core of the railway papers: arithmetic, mensuration, and time-speed-distance built on a secondary-school foundation. Fluency with fractions, percentages and ratios underlies almost every question, so that is where practice pays back fastest.
How much Mathematics is worth in each RRB Section Controller stage, from the official pattern.
| Stage | Questions | Marks | Time | Share |
|---|---|---|---|---|
| Computer Based Test | 25 | 25 | — | 25% |
Every topic in the official syllabus. The linked ones open a set of solved questions you can practise straight away.
Written to the RRB Section Controller pattern, with the answer key and the method behind it — a look at how the section is actually set before you drill the full topic sets.
Simple interest · solved example
Find the simple interest on Rs 2000 at 5% per annum for 3 years.
Solution
SI = P×R×T/100 = 2000×5×3/100 = 300.
Pipes and cisterns · solved example
One pipe fills a tank in 6 hours while another empties it in 9 hours. If both are opened together, in how many hours will the tank be filled?
Solution
Net filling rate is 1/6 − 1/9 = 1/18 of the tank per hour, so it fills in 18 hours.
Time and work · solved example
A can do a piece of work in 12 days and B in 18 days. Working together, in how many days will they finish it?
Solution
Together they do 1/12 + 1/18 = 5/36 of the work a day, so the whole work takes 36/5 = 7.2 days.
Approximation · solved example
Find the approximate value: 24.9% of 360.
Solution
Round to 25% of 360 ≈ 90, which is the closest option.
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Mathematics shows up in every RRB Section Controller mock test, in the same interface, with sectional locking and negative marking.
RRB Section Controller: 23-question practice mock
23 questions | 23 min
RRB Section Controller Latest notified cycle sets 25 Mathematics questions for 25 marks in the Computer Based Test.
Yes. RRB Section Controller deducts one third of a mark for each wrong answer, Mathematics included, so unsure guesses cost you. One third of a mark is deducted for each wrong answer.
The RRB Section Controller syllabus lists Number system, BODMAS, decimals and fractions, LCM and HCF, Ratio and proportion, Percentage, Mensuration, Time and work and more. Weight your revision towards the ones you are weakest on and confirm the emphasis against the paper analysis for recent cycles.
Every Mathematics question on this site is free and written to the exam pattern. Use the topic drills for instant-feedback practice, the daily quiz to keep the section warm, and the RRB Section Controller mock tests to sit it under a real clock with negative marking.