A classroom has 40 students. The number of girls is 5 less than twice the number of boys. Write the two equalities and solve for the amount of boys and girls.

Question

 Write two inequalities and find the amount of boys and girls.

Answer 1

b = number of boys

g = number of girls

 

b + g = 40

g = 2b-5

 

Using substitution replace g with 2b-5 in first equation and solve for b

to find the number of boys

 

b + 2b-5 = 40

3b - 5 = 40

 

Can you finish solving for b to find the number of boys?

Then use g=2b-5 to find the number of girls.... Or subtract the

number of boys from 40 to find number of girls