2 x b +b +3 x b +b:2 = 195
6 x b +b / 2 = 195
12x b + b) / 2 = 195
13 x b = 390
b = 390 : 13
b = 30
a = 30 x 2 = 60
c = 3 x 30 = 90
d = 30 : 2 = 15
graphic ( asta pt ca nu stiu ce clasa esti)
b |__|__|
a |__|__|__|__|
c |__|__|__|__|__|__|
d |__|
195:13 = 15 = d
b = 15x 2 = 30
a = 30 x 2 = 60
c = 30 x 3 = 90
