12:d=6
18 : m = 2
20: n = 10
20:e= 5
m:2=9
3 x n = 30
7 x = 21
7 x d = 49
d x 7 = 7
V x2=0
m x 6 = 0
nx 10 = 10
B x 5 = 40
10 Xa=n
5x p = 30
70: a = 10
60 : b = 6
80: c= 8
V: 7=5
B:2 = 12​