Roger is going to have a party at his house he is inviting three times as...

[IvyhasTwinBoyst]

Boys = X, Girls = 3X
16 = X + 3X so
16 = 4X so
X=4

4 boys, 12 girls.

This math is too easy to be a problem for anyone aged 13+.

 

[karen]

...many girls as boys if he is inviting? 16 people how many boys and how many girls will there be

 

[true]

4 boys and 12 girls