Simultaneous equations help (1 Viewer)

[HSC2014]

n/x = [n/(x+5)] +6
and
n/(x+5) = [n/(x+10)] +4

Solve for n

Any help appreciated!

Edit: Original question: When 5 new classrooms were built for a school, the average class size was reduced by 6. When another 5 classrooms were built, the average class size reduced by another 4. If the number of students remained the same throughout the changes, how many students were there at the school?

 

[HSC2014]

Okay after substitution, seems like the answers are wrong so I've edited them out.