If two painters can complete two rooms in two hours. How many painters would it take to do 18 rooms in 6 hours?
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Two painters can complete two rooms in 2 hours.
that is 4 man hours for two rooms.
which is 2 man hours per room.
18 rooms requires 2*18 =36 man hours.
36 man hours for 6 hours means 36/6=6 men working 6 hours to paint 18 rooms.
The amount of water flowing into a tank doubles every minute.
The tank is full in an hour. When was the tank half full?
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