Whats the Ratio Figure

[Guest]

[tex]\begin{cases} x + y = 4 \\ x - y = 0 \end{cases}[/tex]If I have a population of 390,000

64,000 are red

32,000 are blue

What's the ratio
In an area of 88.06 km

Compared to 1-100 esle where.

Could you do the math for me please.

With kind regards

Mark W