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RRB ALP Number System & Simplification Questions
Practise number system & simplification (quantitative aptitude) for the RRB Assistant Loco Pilot Examination: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.
Number System & Simplification practice
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Q1.Find the next number in the series: 2, 4, 8, 16, 32, ?
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Answer: B — 64
Each term is multiplied by 2.
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Q2.Find the next number in the series: 11, 13, 17, 23, 31, ?
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Answer: A — 41
Differences are 2, 4, 6, 8 → next difference 10.
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Q3.Find the HCF of 20 and 10.
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Answer: C — 10
HCF(20, 10) = 10. Check: HCF × LCM = 10 × 20 = 200 = product of the numbers.
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Q4.Find the HCF of 6 and 10.
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Answer: B — 2
HCF(6, 10) = 2. Check: HCF × LCM = 2 × 30 = 60 = product of the numbers.
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Q5.Find the HCF of 6 and 4.
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Answer: D — 2
HCF(6, 4) = 2. Check: HCF × LCM = 2 × 12 = 24 = product of the numbers.
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Q6.Simplify: 19 + 4 × 9 − 2
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Answer: B — 53
BODMAS: multiply first — 4 × 9 = 36; then 19 + 36 − 2 = 53.
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Q7.Simplify: 82 + 5 × 6 − 35
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Answer: A — 77
BODMAS: multiply first — 5 × 6 = 30; then 82 + 30 − 35 = 77.
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Q8.Simplify: 77 + 4 × 5 − 33
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Answer: C — 64
BODMAS: multiply first — 4 × 5 = 20; then 77 + 20 − 33 = 64.
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Q9.What is √1,369?
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Answer: C — 37
37 × 37 = 1369, so √1369 = 37.
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Q10.Find the next number in the series: 10, 12, 16, 22, 30, ?
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Answer: A — 40
Differences are 2, 4, 6, 8 → next difference 10.
How to approach number system & simplification questions
Learn squares to 30 and cubes to 15, apply BODMAS strictly, and use HCF × LCM = product of two numbers. For series, check the differences first, then the ratios.
About RRB ALP
RRB Assistant Loco Pilot Examination — conducted by Railway Recruitment Boards (RRB). Recruits Assistant Loco Pilots and technicians for Indian Railways.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
RRB ALP practice topics
| Topic | Section | Question source |
|---|---|---|
| Number System & Simplification | Quantitative aptitude | Calculated (new numbers every set) |
| Logical Reasoning | Reasoning | Calculated (new numbers every set) |
| Physics | Science | Calculated + question bank |
| Chemistry | Science | Calculated + question bank |
| Indian Polity, History & Geography | General awareness | Question bank |