Ratio and proportion

Question

On entire earth the ratio between land and water is 1:2 and At northern hemisphere this ratio is 2:3 . what will be the ratio of land with water at southern hemisphere...?

Answer 1

1/2 = x/2 + 2/3/2

1 = x = 2/3

x =1 -2/3 = 1/3

southern hemisphere is a ratio of land to water of 1;3