Question

X/14=y/11=z/12 si x+y-z =39

Answer 1

x=14y/11
z=12y/11

14y/11+y-12y/11=39
2y/11+11y/11=39
13y=39*11
13y=429
y=429:13
y=33

x=14*33/11=14*3=42
z=12*33/11=12*3=36

Answer 2

x/14=y/11=z/12=r
x=14r
y=11r
z=12r
x+y-z=39
14r+11r-12r=39
13r=39
r=3
x=14r=14×3=42
y=11r=11×3=34
z=12r=12×3=36