SOLUTION: 4 men take 8 hours to build a wall, how long will it take 7 men to build an identical wall?

Question 561809: 4 men take 8 hours to build a wall, how long will it take 7 men to build an identical wall?
Answer by ptaylor(2198) (Show Source): You can put this solution on YOUR website!
OK
If 4 men take 8 hours to build a wall, then the wall require 4*8=32 man hours to build. In other words:
32 men could build the wall in 1 hour
16 men could build the wall in 2 hours
8 men could build the wall in 4 hours
etc
Now 7 men would take 32/7=4.57 hr to build the wall

Another way:
Let x=time it takes 7 men to build the wall
1 man works at the rate of 1/32 of the wall per hour
7 men works at the rate of 7/32 of the wall per hour
soooo
7/32*x=1 (1 wall that is)
x=32/7=same as above
Hope this helps---ptaylor

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