If it takes five men 20 hours to build a house how long would it take a man to do the job if they work at the same rate
this problem can be solved by inverse rule of three.
5 men--------------------20 hours
1 man-------------------- x
5 men20 hours=1 manx
x=(5 men*20 hours) / 1 man=100 hours.
answer: 100 hours.