If L and M are the total number of teachers in universities A, B and C together and in universities D, E and F together respectively, then the value of M minus L is exactly equal to the number of teachers in which university?

M minus L equals the number of teachers in university D, so the answer is D.

Universities A, B and C together are 11 plus 17 plus 19, which is 47 percent, so L is 3008.

Universities D, E and F together are 6 plus 29 plus 18, which is 53 percent, so M is 3392.

So M minus L is 3392 minus 3008, which is 384.

University D has 6 percent of 6400, which is 384.

So M minus L equals the teachers in university D.

So the answer is D.