Răspuns:
Explicație pas cu pas:
a)
4x = 5y = 10z = k
x = k/4
y = k/5
z = k/10
x + y + z = 22
k/4 + k/5 + k/10 = 22
5k/20 + 4k/20 + 2k/20 = 22
11k/20 = 22
k = 22 : 11/20 = 22*20/11 = 40
x = 40/4 = 10
y = 40/5 = 8
z = 40/10 = 4
b)
4x = 5y = 10z = k
x = k/4
y = k/5
z = k/10
x*y*z = 40
(k/4)*(k/5)*(k/10) = 40
k³/200 = 40
k³ = 40*200 = 8000 = 20³
k = 20
x = 20/4 = 5
y = 20/5 = 4
z = 20/10 = 2