21/4
14
21 is the answer
35.2941% difference.
there is no fraction between the numbers 3 21 and 421
4
21/4
NB 3,9,21,39,63. We note that #1;The difference between 3 & 9 = 6 #2 ;The difference between 9 & 21 = 12 ( 2 x 6) #3 ; The difference between 21 & 39 = 18 ( 3 x 6) #4 ; The difference between 39 & 63 = 24 ( 4 x 6) So it follows #5 ; The difference between 63 & X = ( 5 x 6 = 30 ) So 63 + 30 = 93 The answer !!!!!
89 - 21 = 68
FM 21-11 is numbered in the old system. FM 4-25.11 is numbered in the new system. The book is the same.
It is 55 minus 21 = 34
21
14
21 is the answer
21
3-4 = -1 -21 the distance between -1 and -21 is -20 -20 -1 = -21
10% difference.