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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 average of five consecutive odd numbers is 25. The largest number is:

    Answer: 29

    If the middle number is 25, the five numbers are 21, 23, 25, 27, 29, so the largest is 29.

  2. A pipe can fill a tank in 6 hours and another can empty it in 8 hours. If both are open, how long to fill the tank?

    Answer: 24 hours

    Net rate = 1/6 − 1/8 = 1/24, so the tank fills in 24 hours.

  3. √(144) + √(81) = ?

    Answer: 21

    √144 = 12 and √81 = 9, so 12 + 9 = 21.

  4. Two numbers are in the ratio 4:7. If their difference is 18, the smaller number is:

    Answer: 24

    Difference corresponds to 3 parts = 18, so 1 part = 6; smaller number = 4 × 6 = 24.

  5. What is 15% of 240?

    Answer: 36

    15% of 240 = (15/100) × 240 = 36.

  6. A car covers 150 km in 2.5 hours. How long will it take to cover 300 km at the same speed?

    Answer: 5 hours

    Speed = 150/2.5 = 60 km/h; time for 300 km = 300/60 = 5 hours.

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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