Math help! please explain this to me!?

Question

i dont understand what 2 equations i should use.

Mrs. Gambales math class has 29 students enrolled. The number of girls in the class is one less than three times one-half the number of boys. how many boys and how many girls are in the class?

please help! or give me a website i can find help for

Answer 1

g + b = 29

g = 3(.5)b - 1  

Answer 2

Let's set up your variables first.

b = number of boys

g = number of girls

g = 3/2b - 1

g + 1 = 3/2b

2/3g + 2/3 = b

b = 2/3g + 2/3

Try to find key words in the problem. Words like "is" is the same thing as "equals". Also, you don't always write the equation in the same order as the problem says it.

Now you have to rearrange your equation to get the "b" variable on one side. To undo what's been done, you have to do the inverse. For example, if 1 has been subtracted to one side, you have to ADD one to both sides. If one side has been multiplied by 2/3, you have to divide both sides by 2/3 (which is the same as multiplying 3/2).

Hope this helps.

Answer 3

g girls

b boys;

g+b=29

g+1=3*(1/2b)

g=29-b

29-b+1=3/2b

30= 5/2b

b=12

g=17

Answer 4

boys + girls = 29

girls + 1 = 3 X boys/2

so;

girls = 29 - boys

29 - boys + 1 = 3 X boys/2

30 - boys = 3/2 X boys

30 = 3/2 X boys + boys

30 = boys(3/2 + 1) = boys (2.5)

30/2.5 = 12 = boys

12 + girls = 29

girls = 17

Answer 5

x + (1/2x)3 - 1 =29

1x+1.5x=30

2.5x= 30

x= 12

12 boys

17 girls

Answer 6

x = number of boys in class

x/2 = half of the number of boys

So 3x/2-1 = number of girls

3x/2 - 1 + x = 29

5x/2 =30

5x= 60

x = 12 boys

29-x = 17 girls

  

Answer 7

boys =x

# girls =3x/2-1

the equation is than x+3x/2-1=29

solve to find x the # of boys, then calculate the # of girls

x+3x/2=30

2x+3x=60

x=12

therefore there are 12 boys and 17 girls..

  

Good Luck!