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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. The compound interest on ₹1,000 at 10% per annum for 2 years is:

    Answer: ₹210

    CI = 1000 × (1.1)² − 1000 = 1210 − 1000 = ₹210.

  2. If 3x + 7 = 22, the value of x is:

    Answer: 5

    3x = 22 − 7 = 15, so x = 5.

  3. The perimeter of a rectangle is 60 cm and its length is 18 cm. Its width is:

    Answer: 12 cm

    Perimeter = 2(l + w), so 60 = 2(18 + w), giving w = 12 cm.

  4. A shopkeeper gives a 10% discount on a marked price of ₹800. The selling price is:

    Answer: ₹720

    Selling price = 800 × (1 − 0.10) = 800 × 0.90 = ₹720.

  5. The HCF of 36 and 48 is:

    Answer: 12

    The highest common factor of 36 and 48 is 12.

  6. A work is completed by A in 10 days and by B in 15 days. Working together, they complete it in:

    Answer: 6 days

    Combined rate = 1/10 + 1/15 = 1/6, so together they finish in 6 days.

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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