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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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