Notam cu a,b,c,d cele 4 numere
a = b:3 =>b = 3×a
c=a
c = d:4 =>d = 4×c
d-c = 27
a |___|
b |___|___|___|
c |___|
d |___|___|___|___|
4 segmente egale - 1 segment egal =3 segmente egale = 27
27:3 = 9 (un segment)
a= 9
b = 3×9 = 27
c = 9
d = 4×9 = 36
a+b+c+d = 9+27+9+36 = 81