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5 men take 21 minutes
So 1 man will take (5*21) = 105 minutes. ( Its obvious that 1 man will take more days so simply multiply to get days taken by 1 man)
Now, 7 men will take 105/7 = 15 minutes. ( Its again obvious that when we increase the number of people then the work will be done faster in less days and so we divided)
Answer is 15 minutes.
1 Person will complete the task in (5*21) = 105 minutes
Therefore, 7 people will take them 15 minute (105/7) to build the wall.
7 PERSONS WILL TAKE 15 MINUTES TO COMPLETE THE WALL
the wall will be built in 15 days by seven people
Seven person should complete it within 15 Minutes,
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