Problems On H.C.F And L.C.M – Aptitude MCQ Questions – 15 Posted on July 10, 2020July 10, 2020 by admin Question 1An electronic device makes a beep after every 60 sec. Another device makes a beep after every 62 sec. They beeped together at 10 am. The next time, when they would beep together at the earliest is = ? A. 10.30 am B. 10.31 am C. 10.59 am D. 11 am Question 2Three girls start jogging from the same point around a circular track and each one completes one round in 24 seconds, 36 seconds and 48 seconds respectively. After how much time will they meet at one point ? A. 2 minutes 20 seconds B. 2 minutes 24 seconds C. 3 minutes 36 seconds D. 4 minutes 12 seconds Question 3The difference between the greatest and least prime numbers which are less then 100 is = ? A. 95 B. 96 C. 97 D. 94 Question 4Four bells begin to toll together and toll respectively at intervals of 6, 7, 8 and 9 seconds. In 1.54 hours, how many times do they toll together and in what interval (seconds)? A. 14, 504 B. 14, 480 C. 12, 504 D. 16, 580 Question 5The number of pairs of positive integers whose sum is 99 and HCF is 9 is = ? A. 5 B. 2 C. 3 D. 4 Question 6The HCF and LCM of two numbers are 21 and 84 respectively. If the ratio of the two numbers is 1 : 4 then larger of the two numbers is = ? A. 48 B. 12 C. 84 D. 108 Question 7A number between 1000 and 2000 which when divided by 30, 36 and 80 gives a remainder 11 in each case is = ? A. 11523 B. 1451 C. 1641 D. 1712 Question 8The number between 4000 and 5000 that is divisible by each of 12, 18, 21 and 32 is = ? A. 4203 B. 4023 C. 4032 D. 4302 Question 9Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. In 30 minutes , how many times do they toll together ? A. 4 B. 10 C. 15 D. 16 Question 10The LCM of two numbers is 12 times their HCF. The sum of the HCF and LCM is 403. If one of the number is 93, then the other is = ? A. 116 B. 124 C. 112 D. 120