Question

Aplicando as propriedades, resolva as proporções:
a) x/6 = y/5, sendo x-y =15
b)2/x= 5/y, sendo x+y =140
c) x/8 = y/5 = z/2, sabendo que x+y +z =90
d) a/7 = b/3 = c/2 sabendo que a +b +c

Answer 1

Ola Patricia 

a) 

x/6 = y/5 = (x - y)/(6 - 5) = 15/1 = 15

x = 6*15 = 90
y = 5*15 = 75 

b)

2/x = 5/y = (2 + 5)/(x + y) = 7/140 = 1/20

x/2 = 20
x = 40

y/5 = 20
y = 100

c)

x/8 = y/5 = z/2 = (x + y + z)/(8 + 5 + 2) = 90/15 = 6

x = 8*6 = 48
y = 5*6 = 30
z = 2*6 = 12 

d) incompleto