Put \(x\) is the number of  males;n is the number of male students must be moved to another school

We have:\(\left\{{}\begin{matrix}\dfrac{x}{2000}.100=70\\\dfrac{x-n}{2000-n}.100=60\end{matrix}\right.\) 

\(\Rightarrow\left\{{}\begin{matrix}x=1400\\x-n=0,6\left(2000-n\right)\end{matrix}\right.\)\(\Rightarrow1400-n=1200-0,6n\)

\(\Rightarrow0,4n=200\Rightarrow n=200:0,4=500\)

So the answer is:500 male students

Put x

 is the number of  males;n is the number of male students must be moved to another school

We have:⎧⎪ ⎪⎨⎪ ⎪⎩x2000.100=70x−n2000−n.100=60

⇒{x=1400x−n=0,6(2000−n)

⇒1400−n=1200−0,6n

⇒0,4n=200⇒n=200:0,4=500

So the answer is:500 male students