Question

Aflați numerele x, y, z:

Answer 1

x/6=y/7=z/8 stiind ca:x+y-z=20
vom forma o proportie si va fi asa:
(x+y-z)/(6+7-8)=20/5
acum vom face:
x/6=20/5
x=120/5
x=24

y/7=20/5
y=140/5
y=28

z/8=20/5
z=160/5
z=32.

Daca observam avem:
x=24
y=4+x
z=4+y

Vom face si proba:
24+28-32=52-32
=20