1. There are 22 students in a classroom. There are 12 more girls than boys. Find the number of boys and girls in the classroom.

Answer 1

This is a perfect problem to use substitution;

we can start with boys + girls = 12

b + g = 12 and since we know that there are 12 more girls than boys we can write g = b + 12

using substitution we get;

b + b + 12 = 22

2b + 12 = 22

2b = 10

b = 5, g= b + 12, therefore g = 5 + 12 = 17

5 boys and 17 girls

Answer 2

X+x+12=22

2x+12=22

2x=10

X=5

5 boys 17 girls