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Mathematics Flashcards

6 cards from real RRB NTPC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Mathematics flashcards as text

  1. A train travels 360 km in 4 hours. What is its speed in km/h?

    Answer: 90

    Speed = Distance ÷ Time = 360 ÷ 4 = 90 km/h.

  2. The LCM of 12 and 18 is:

    Answer: 36

    The LCM of 12 and 18 is 36 because 36 is the smallest number divisible by both.

  3. If a number is increased by 20% and then decreased by 20%, the net change is:

    Answer: 4% decrease

    After a 20% increase and 20% decrease, the net effect is a 4% decrease (100 × 1.2 × 0.8 = 96).

  4. What is the simple interest on ₹5,000 at 8% per annum for 3 years?

    Answer: ₹1,200

    SI = (P × R × T) / 100 = (5000 × 8 × 3) / 100 = ₹1,200.

  5. The ratio of two numbers is 3:5 and their sum is 64. The larger number is:

    Answer: 40

    The larger number = (5/8) × 64 = 40, since 5 parts out of a total of 8 parts.

  6. A man buys an article for ₹400 and sells it for ₹500. His profit percentage is:

    Answer: 25%

    Profit % = (Profit / Cost Price) × 100 = (100/400) × 100 = 25%.

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Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. pib.gov.in — Eligibility, registration deadline · verified Oct 2026
  2. rrb.indianrailways.gov.in — Test delivery, fees, exam format, passing score, time limit · verified Oct 2026
  3. rrbapply.gov.in — Registration deadline · verified Oct 2026