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