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Arithmetic and Number Systems 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.

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  1. A train 150 m long passes a pole in 15 seconds. What is the speed of the train in km/h?

    Answer: 36 km/h

    Speed = Distance/Time = 150/15 = 10 m/s. Converting to km/h: 10 × 18/5 = 36 km/h.

  2. The LCM of 12, 18, and 24 is:

    Answer: 72

    LCM of 12, 18, 24: Prime factorize: 12=2²×3, 18=2×3², 24=2³×3. LCM = 2³×3² = 8×9 = 72.

  3. If the simple interest on a sum for 2 years at 5% per annum is Rs. 400, what is the principal?

    Answer: Rs. 4000

    SI = PRT/100 → 400 = P×5×2/100 → P = 400×100/10 = Rs. 4000.

  4. What is 15% of 480?

    Answer: 72

    15% of 480 = (15/100) × 480 = 15 × 4.8 = 72.

  5. A number when divided by 6 leaves a remainder of 3. What will be the remainder when the same number is divided by 3?

    Answer: 0

    If N = 6q + 3, then N = 3(2q+1), so N is exactly divisible by 3, leaving remainder 0.

  6. The ratio of the ages of A and B is 3:5. If the sum of their ages is 64 years, what is B's age?

    Answer: 40 years

    Let ages be 3x and 5x. Then 3x + 5x = 64 → 8x = 64 → x = 8. B's age = 5x = 5×8 = 40 years.

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Sources & references

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  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