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?
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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.
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Georgia say: 7x boys 7x - 4x = 9
4x girls 3x = 9. x = 3

7x --> 7*3 = 21
4x --> 4*3 = 12

= 33 students
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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
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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.
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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
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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
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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
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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 21-12=9
now just 21+12=33
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Mike G say: G = Girls
(G+9)/G = 7/4
4G+36 = 7G
Girls = 12
Boys = 21
Answer 33
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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

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