Respuesta :
Answer:
number of girls = 7 + 8 = 15
The uknown in the class are the number of boys
Step-by-step explanation:
number of students = 23
let number of boys = y
number of girls = 7 + y
number of girls can be computed as
number of girls = students - y
number of girls = 23 - y
7 + y = 23 -y
-16 = - 2y
y = 8
number of boys = 8
number of girls = 7 + 8 = 15
The number of teacher is the unknown