Respuesta :

Solution

For this case we know that the total of students are 396 so we can do this:

x + y = 396

Where:

x= number of girls

y = number of boys

Then we have the following condition:

4x = 7y

Then solving for x we got:

x = 7/4 y

Replacing in the first equation we got:

7/4 y + y = 396

11/4 y= 396

y= 396*4/11 = 144

And x= 7/4 * 144 = 252

Then the answer would be:

252 girls and 144 boys

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