Fie a,b,c,d -cele 4 numere
a=b/5=b=5a
b=c/3=c=3b=c=3x5a=c=15a
d=a+59
30a=a+59
30a-a=59
29a=59
a=59/29
b=5x59/29=295/29
c=15 x 59/29=885/29
d=30x59/29=1770/29
