Question

HELP!!! Calcular x, y, z, nas proporções x/5 = y/4 e y/3 = z/7, sendo x + y + z = 330. Why? - > Resp. : 90; 72 e 168.

Answer 1

x/5=y/4
x=5y/4

y/3=z/7
z=7y/3

x+y+z=330
(5y/4)+y+(7y/3)=330  m.m.c.(3 , 4)=12
15y+12y+28y=330.12
55y=330.12
y=330.12/55
y=6.12
y=72

x=5y/4
x=5.72/4
x=5.18
x=90

z=7y/3
z=7.72/3
z=7.24
z=168

Portanto:
x=90
y=72
z=168