All members of our painting team paint at the same rate. If 8 members can paint a specific wall in 36minutes, then how long would it take 18 members to paint the same wall, in minutes?
Actually, it would take 12 minutes.
*1 and 12 are incorrect it is 8 minutes
If there is an increase of 18/8 =2.25 times in manpower, there should be a corresponding decrease in time.
Therefore, 36 minutes x 1/2.25 = 16 minutes for 18 people to finish the job.
oops I thought it said how long for 9 people