Let x represent the number of girls. Then x + 4 represents the number of boys. (there are 4 more boys than girls) To solve this we can set up a simple equation.
# of girls + # of boys = 16 people x + (x+4) = 16 x + x + 4 = 16 2x + 4 = 16 2x = 16 - 4 2x = 12 x = 12 / 2 x = 6
