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16. 

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.

283
C.

308
D.

318
17. 

What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30 ?

A. 196
B.

630
C.

1260
D.

2520
18. 

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

A. 12
B.

16
C.

24
D.

48
19. 

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

A. 1008
B.

1015
C.

1022
D.

1032
20. 

252 can be expressed as a product of primes as:

A. 2 x 2 x 3 x 3 x 7
B.

2 X 2 x 2 x 3 x 7
C.

3 x 3 X 3 x  3 x  7
D.

2 X 3 x 3 x 3 x 7