Aptitude  HCF and LCM  Practice Q&A

1. Six bells start ringing together and ring at intervals of 4, 8, 10, 12, 15 and 20 seconds respectively. How many times will they ring together in 60 minutes ?

31 15 16 30

2. What is the greatest number which divides 24, 28 and 34 and leaves the same remainder in each case?

1 2 3 4

3. The greatest number of four digits which is divisible by 15, 25, 40 and 75 is:

9000 9400 9600 9800

4. What is the LCM of 2/3,5/6 and 4/9 ?

3/10 3/20 10/3 20/3

5. A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and c in 198 seconds, all starting at the same point. After what time will they again at the starting point ?

26 minutes and 18 seconds 42 minutes and 36 seconds 45 minutes 46 minutes and 12 seconds

6. What is the least number which when doubled will be exactly divisible by 12, 14, 18 and 22 ?

1286 1436 1216 1386

7. Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of the last two is 1073. The sum of the three numbers is:

75 81 85 89

8. What is the least number which when divided by 5, 6, 7 and 8 leaves a remainder 3, but when divided by 9 leaves no remainder?

1108 1683 2007 3363

9. The least multiple of 7, which leaves a remainder of 4, when divided by 6, 9, 15 and 18 is:

74 94 184 364

10. What is the HCF of 2.04, 0.24 and 0.8 ?

1 2 0.02 0.04

 

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