Răspuns :
7 / x = y / 3 = K
7 / x = K => x = 7 K
y / 3 = K => y = 3 K
3 x 7 K x 3 K - 60 =
= 63 K - 60
= 3
7 / x = K => x = 7 K
y / 3 = K => y = 3 K
3 x 7 K x 3 K - 60 =
= 63 K - 60
= 3