Răspuns :
a/b = 3/10 ==> b = 10a/3
b/c = 5/6 ==> 10a/3c = 5/6
10a = 5×3c/6
10a = 15c/6
60a = 15c
a/c = 15/60
a/c = 1/4
b/c = 5/6 ==> 10a/3c = 5/6
10a = 5×3c/6
10a = 15c/6
60a = 15c
a/c = 15/60
a/c = 1/4