If five person build a wall in 21 minutes, how long does it take seven people to build the same wall?

It would take 7people 15minutes to build the same wall.

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

• it is inverselly proptional statement if num of person increases at the same rate then the num of person decreses at same rate such as if 5 person build wall in21 min then 7 person will build it in 15 min

 Seven person should complete it within 15 Minutes,