Răspuns: 91
Explicație pas cu pas:k
y = 144 : x; k = 72 : z; y : z = k si k × 5 = 45
_________________________________
k × 5 = 45
k = 45 : 5
k = 9
___________
k = 72 : z
9 = 72 : z
z = 72 : 9
z = 8
____________
y : z = k
y : 8 = 9
y = 9 × 8
y = 72
__________
y = 144 : x
72 = 144 : x
x = 144 : 72
x = 2
____________
x + y + z + k = 2 + 72 + 8 + 9 = 91 → suma numerelor
