Question

x/6 =y/5, sendo x-y= 15

Answer 1

x - y = 15
y = x - 15
x/6 = y/5
5x = 6y
5x = 6(x - 15)
5x = 6x - 90
x = 90

y = x - 15
y = 90 -15
y = 75

Portanto:

x = 90
y = 75

Bons estudos!