Asked by student #1
                A class has 42 pupils. The ratio of the number of boys to the number of girls is 5 : 2. Find the number of boys in the class.
My understanding is that in order to find the number of boys, you need to find BOTH genders first, and so I could only get up to the number of GIRLS, which I did: 42 divided by 2 = 21
42 divided by 5 = 8.4
But now I'm stuck...
Please help and see if my understanding is correct...
            
        My understanding is that in order to find the number of boys, you need to find BOTH genders first, and so I could only get up to the number of GIRLS, which I did: 42 divided by 2 = 21
42 divided by 5 = 8.4
But now I'm stuck...
Please help and see if my understanding is correct...
Answers
                    Answered by
            oobleck
            
    boys : girls = 5:2
So, if there are 5x boys, there are 2x girls
5x+2x = 42
x = 6
Now what do you say?
    
So, if there are 5x boys, there are 2x girls
5x+2x = 42
x = 6
Now what do you say?
                    Answered by
            student #1
            
    So basically the number of boys is 6?
And so is girls??
    
And so is girls??
                    Answered by
            oobleck
            
    NO!
I solved for the value of x.
Now go back and read what I said about the number of girls and boys.
    
I solved for the value of x.
Now go back and read what I said about the number of girls and boys.
                    Answered by
            student #1
            
    Ohhhh I get it
So 5x = 5 x 6 = 30 (BOYS)
And 2x = 2 x 6 = 12 (GIRLS)
So the number of boys is 30 yes?
    
So 5x = 5 x 6 = 30 (BOYS)
And 2x = 2 x 6 = 12 (GIRLS)
So the number of boys is 30 yes?
                    Answered by
            oobleck
            
    that's better.
Consider a "group" of students to be 5 boys and 2 girls.
x is the number of such groups in the class.
    
Consider a "group" of students to be 5 boys and 2 girls.
x is the number of such groups in the class.
                    Answered by
            30
            
    5×5×5×1030
    
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