There are 28 students in Lisa's algebra class there are 12 more girls than boys how many girls are in the class

Question

There are 28 students in Lisa's class there are 12 more girls than boys how many girls are in the class

Answer 1

Cool so let the number of boys be b

 

then 

 

b + (b+12) = 28

 

since the total of both the girls and the boys is 28

 

2b = 16

 

b = 8

 

Next we find what g or the number of girls in the class is which is the same as b+12

 

g = 8+12

 

= 20 girls

 

thats your answer.

Answer 2

b = boys    g = girls

 

b + g = 28

 

b + 12 = g     since there are more girls, we must add 12 to make the values equal.

 

Substitute (b + 12) for g in the top equation

 

b + (b + 12) = 28                      combine b

 

2b + 12 = 28                            subtract 12

 

2b = 16                                    divide by 2

 

 

b = 8            8 boys

 

add 12

 

20 girls