1. Four different electronic devices make a beep after every 30
minutes, 1 hour, 1 and half hour and 1 hour 45 minutes respectively. All
the devices beeped together at 12 noon. They will again beep together at:

[A] 12 midnight [B] 6 a.m. [C]
3 a.m. [D] 9 a.m.

2. The H.C.F of 204, 1190 and 1445 is:

[A] 17 [B] 19 [C] 18 [D] 21

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

[A] 74 [B]
184 [C] 94 [D] 364

4. The least number which when divided by 5, 6,
7 and 8 leaves a remainder 3, but when divided by 9 leaves no remainder, is:

[A] 1677 [B] 2523 [C]
1683 [D] 3363

5. Find the greatest number that will divide 43,
91 and 183 so as to leave the same remainder in each case.

[A] 4 [B] 9 [C] 7 [D] 13

6. The smallest number which when diminished by
7, is divisible by 12, 16, 18, 21 and 28 is:

[A] 1008 [B] 1022 [C]
1015 [D] 1032

7. The maximum number of students among them
1001 pens and 910 pencils can be distributed in such a way that each student
gets the same number of pens and same number of pencils is:

[A] 91 [B] 1001 [C] 910 [D] 191116.

8. The least number, which when divided by 12,
15, 20 and 54 leaves in each case a remainder of 8, is:

[A] 504 [B] 544 [C] 536 [D] 548

9. Find the least number which when divided by
16, 18, 20 and 25 leaves 4 as remainder in each case, but when divided by 7
leaves no remainder.

[A] 17004 [B] 18002
[C] 18000 [D] 18004

10. Find the least multiple of 23, which when
divided by 18, 21 and 24 leaves remainders 7, 10 and 13 respectively.

[A] 3002 [B] 3024 [C] 3013 [D] 3036

11. The largest four – digit number which when
divided by 4, 7 or 13 leaves a remainder of 3 in each case, is

[A] 8739 [B] 9834 [C] 9831 [D]
9893

12. The L.C.M. of 22, 54, 108, 135 and 198 is:

[A] 330 [B] 5940 [C] 1980 [D]
11880

13. Six 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] 15 [C] 10[D] 16

14. The H.C.F of 2923 and 3239
is :

[A] 37 [B] 73 [C] 47 [D] 79

15. The H.C.F. of two numbers is 11 and their
L.C.M. is 7700. If one of the numbers is 275, then the other is:

[A] 279 [B] 308 [C] 283 [D] 318

16. The least number which should be added to
2497 so that the sum is exactly divisible by 5, 6, 4 and 3 is:

[A] 3 [B] 23 [C] 13 [D] 33

17. The product of the L.C.M. and H.C.F. of two
numbers is 24. The difference of two numbers is 2. Find the numbers.

[A] 2 and 4 [B] 8 and 6 [C] 6
and 4 [D] 8 and 10

18. The least number which when increased by 5 is
divisible by each one of 24, 32, 36 and 54, is

[A] 427 [B] 869 [C] 859 [D]
4320

19. The ratio of two numbers is 3 : 4 and their
H.C.F. is 4. Their L.C.M. is:

[A] 12 [B] 24 [C] 16 [D] 48

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

[A] 9000 [B] 9600 [C] 9400 [D] 9800

21. The product of two numbers is 1320 and their
H.C.F. is 6. the L.C.M. of the numbers is:

[A] 220 [B] 1326 [C] 1314 [D]
7920

22. The least number of five digits which is
exactly divisible by 12, 15 and 18, is:

[A] 10010 [B] 10020 [C] 10015
[D] 10080

23. The H.C.F. and L.C.M. of two numbers are 11
and 385 respectively. If one number lies between 75 and 125, then that number
is:

[A] 77 [B] 99 [C] 88 [D] 110

24. The greatest number which can divide 1356,
1868 and 2764 leaving the same remainder 12 in each case, is:

[A] 64 [B] 156 [C] 124 [D] 260