Answer:
(n + 4) *2 = 11 * 2
Step-by-step explanation:
Divide both sides by 2
n + 4 = 11
d
keep change flip
keep 6/7
change division to multiplication
flip 18/3 to 3/18
5 girls : 15 boys
divide each by 5
1 girl: 3 boys
Choice C