A karate do you have six girls and nine boys then two more girls in three more boys join the team did the ratio girls and boys stay the same explain

The initial ratio - 6 girls:9 boys

This can be simplified to a 2:3 ratio (dividing by 3 on both sides of the ratio).

Then two more girls and three more boys join the team (new ratio - 8:12).

Simplify this ratio and you get 2:3 as well (division by 4).

So the ratio stays the same because the same ratio is present in both cases (2:3).