There are 57 students in the class. The ratio of boys to girls is 4:15. How many boys need to leave the room so the ratio becomes 4:11?
It would seem that there is a problem with the question....?
If a number of girls would be required to leave it would be
If boys are asked to leave the room then the number of girls will stay the same.
We would like the scenario of:
This will not work with an exact number because
The required number of boys is:
However, if the question was meant as "How many girls must leave the room?" it would mean that the number of Boys would stay the same and we would have...
In this case