I'll give you a question, please answer with step-by-step reasoning process.
There are 80 men in a race. 1/4 of the men tripped and were unable to finish. 2/3 of the remaining men were dehydrated and 1/5 of those dehydrated men couldn't finish the race. How many men finished the race?

52
1 / 4 of 80 men is 80 / 4 = 20 men.

20 men couldn't finish, so 80 - 20 = 60 men remain.

60 * 2 / 3 = 40 men were dehydrated.

1 / 5 of the dehydrated couldn't finish 40 * 1 / 5 = 8 men.

60 - 8 = 52 men finished the race.

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Thus, the answer is 52