Answer:
4:1 (I think)
Step-by-step explanation:
Let's write some equations first:
For both prices increasing by 20:
[tex]\frac{x+20}{y+20} =\frac{5}{2}[/tex]
then we can use cross multiplication
2x+40=5y+100
For both prices decreasing by 5:
[tex]\frac{x-5}{y-5} =\frac{5}{1}[/tex]
same here:
5y-25=x-5
Using substitution for 5y, we get: 5y=x+20
2x+40=5y+100
2x+40=x+20+100
x=80
plugging this in to the second equation:
5y-25=x-5
5y-25=80-5
5y-25=75
5y=100
y=20
therefore we get x:y=80:20
4:1
