Verbal - Analogy -> Numbers

DIRECTIONS : Choosing a similarly related pair as the given pair on the basis of the relation between the numbers in each pair.
16. Given set :(12, 20, 4)
  A.   (5,10,5)
  B.   (13,18,5)
  C.   (17,27,5)
  D.   (20,15,25)
17. Given set :(18, 8, 2)
  A.  (3,7,1)
  B.  (11,12,10)
  C.  (17,9,3)
  D.  (24,22,4)

18. Given set :(63,49,35)
  A.   (72,40,24)
  B.   (72, 48, 24)
  C.   (64,40,28)
  D.   (81,63,45)
19. 7528:5362 : : 4673:?
  A.   2367
  B.   2451
  C.   2531
  D.   None of these
20. 25: 37: : 49: ?
  A.   41
  B.   56
  C.   60
  D.   65
123 45678 Page 4 of 8