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Interview Q&A / Aptitude

INTERVIEW Q&A · 116 QUESTIONS

Aptitude interview questions

Quantitative shortcuts for placement tests: percentages, time and work, and more.

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  1. Four bells toll at intervals of 6, 8, 12 and 18 minutes. If they toll together at 8:00 AM, when do they next toll together, and how many times in 12 hours?

    LCM(6, 8, 12, 18) = 72 minutes, so they next ring together at 9:12 AM. In 12 hours (720 minutes) they ring together 720 / 72 = 10 more times, or 11 times counting the 8:00 AM ring.

    BeginnerQuick answer1 min read
  2. The HCF of two numbers is 12 and their LCM is 336. If one number is 48, what is the other?

    The other number is 84. For any two numbers, HCF x LCM = product of the numbers, so the other number is 12 x 336 / 48 = 84.

    BeginnerQuick answer1 min read
  3. What is the least number which, when divided by 12, 15, 20 and 54, leaves a remainder of 8 in each case?

    548. The number minus 8 must be a multiple of all four divisors. LCM(12, 15, 20, 54) = 540, so the least such number is 540 + 8 = 548.

    BeginnerQuick answer1 min read