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Answer on Algebra Question for chase

Question #15893
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?

Expert's answer
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,
then n=80*(4/5)*(3/4)=48

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