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Answer to question #22
You have a 3 and a 5 litre water container,
each container has no markings except for that which gives you it's
total volume.
You also have a running tap. You must use the containers and the tap in
such away as to exactly measure out 4 litres of water. How is this done?
You might remember this puzzle from Die Hard with
a vengeance where Bruce Willis and Samuel L. Jackson have to diffuse a bomb by
placing 4 gallons of water on a set of scales...
There are two ways to solve this, maybe the
question could be modified to say the 5 litre can
doesn't fit under the tap...
Number 1
- Fill the 5 litre can
from the tap
- Empty the 5 litre can into the
3 litre can - leaving 2 litres in the
5 litre can.
- Poor away the contents of the 3 litre can.
- Fill the 3 litre can with the 2 litres from the
5 litre can - leaving 2 litres in the
3 litre can.
- Fill the 5 litre can from the tap.
- Fill the remaining 1 litre space in the 3 litre can
from the 5 litre can.
Leaving 4 litres in the 5 litre can.
Number 2
- Fill the 3 litre can
from the tap.
- Empty the contents of the 3 litre can into the
5 litre can.
- Fill the 3 litre can from the tap.
- Empty the contents of the 3 litre can into the
5 litre can. - Leaving the
5 litre can full and 1 litre in the
3 litre can.
- Poor away the contents of the 5 litre can
- Poor the 1 litre from the 3 litre can into the
5 litre can.
- Fill the 3 litre can from the tap.
- Empty the contents of the 3 litre can into the
5 litre can.
Leaving 4 litres in the 5 litre can.
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