Question

If 8 members took 10 hours to build a wall how many hours has been taken by 4 members to build the same wall​

Answer 1

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Originally Answered: If it takes ten hours for eight men to build a wall, how long would it take for four men? The construction of the wall requires 10 hours * 8 men = 80 man-hours. So if 4 men are employed they will complete the wall in 80 man-hours/4 men = 20 hours. Mathematically, the answer is 20 hours.

Answer 2

$time \: taken \: by \: 8 \: members \: to \: build \: the \: wall = 10 \: hours$

$time \: taken \: by \: 1 \: members \: to \: build \: the \: wall = 10 \times 8$

$time \: taken \: by \: 4\: members \: to \: build \: the \: wall = \frac{10 \times 8}{4} = 20 \: hours$