Answer to Question #15893 in Algebra for chase
There were runners to start a race. In the first half of the race, of them dropped out. In the second half of the race, of the remaining runners dropped out. How many runners finished the race?
Since we haven't exact input data, then we consider next example:
there were 80 runners at start.
After first half 1/5 of runners dropped out.
=> 4/5 remained
After second half 1/4 of remained runners dropped out.
=> 3/4 remained
So if n is number of runners who finished the race,