Agroup consisted of 2 girls for every boy. 24 girls joined the group. there are now 5 girls for every boy. how many boys are in the group

The new ratio is 5:1.
5 girls to every 1 boy is, 8 boys and 40 girls.
So there is now 8 boys in the group

Situation 1:

Situation 2:

Replacing g in the second equation:

In the Situation 1 there was 16 girls and 8 boys = 24 persons
In the Situation 2 there are 40 girs + 8 boys = 48 persons