Since it took 10 hours for 8 men to build a wall. If you had 4 men build a wall it would most likely take twice as long than if there were 8 men due to less people.
So it would take 20 hours for 4 men to build a wall.
Answer:
I want to say 20
Explanation:
4 is half of 8, so double the time and its 20.........
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