Plz help me i am really stuck on a question!?
In a class the ratio of boys to girls is 7:4
There are 9 more boys then girls .
How many children are in the class?

answers:
Philomel say: If there are 7B and 4G the difference is 3.
If there are three sets the difference is 9
3*7=21B
3*4=12G
12+21=33 children.

Georgia say: 7x boys 7x  4x = 9
4x girls 3x = 9. x = 3
7x > 7*3 = 21
4x > 4*3 = 12
= 33 students

Puzzling say: Let 7x be the number of boys
Let 4x be the number of girls
The difference is 9:
7x  4x = 9
3x = 9
x = 3
So now we can figure the actual number of boys:
7x > 7*3 = 21
and girls
4x > 4*3 = 12
Answer:
33 students

Krishnamurthy say: In a class the ratio of boys to girls is 7 : 4
There are 9 more boys then girls .
How many children are in the class?
There are 33 children in the class.

geezer say: Here is a ''short cut'' for you
The ratio is 7 : 4
7  4 = 3
7 + 4 = 11
3 x 11 = 33
There are 33 in the class

Como say: :
Boys_______Girls
x + 9________x
7___________4
(x + 9) / 7 = x / 4
4x + 36 = 7x
36 = 3x
x = 12
12 girls , 21 boys
33 in in class

Iggy Rocko say: Let b and g be the numbers of boys and girls, respectively.
b/g = 7/4
b = g + 9
Solve the system of equations.
(g + 9)/g = 7/4
g + 9 = 7g/4
4g + 36 = 7g
36 = 3g
g = 12
b = 21
# of children = 12 + 21 = 33

Not say: The 3 points scale difference is the 9 boys more difference.
Scale 3 times and you get the data.
3x7:3x4 = 21:12
see 2112=9
now just 21+12=33

Mike G say: G = Girls
(G+9)/G = 7/4
4G+36 = 7G
Girls = 12
Boys = 21
Answer 33

Wayne DeguMan say: G > x
B > x + 9
so, 4(x + 9) = 7x
=> 4x + 36 = 7x
i.e. 3x = 36
=> x = 12
so, 12 girls and 21 boys
i.e. 33 in the class
:)>
