Karma: 6170

You are standing by a river with a 5-gallon jug and a 3-gallon jug, but you need exactly 4 gallons of water. Using only the 2 jugs you have, how can you measure out 4 gallons?

Answer this

+4 Views: 1228 Answers: 5 Posted: 12 years ago

bobbyjeo

if thats the case then how do you know when its excatly half way empty

Commented 12 years ago

5 Answers

Bob/PKB

Karma: 945575

1. Fill the 3 gallon jug. Pour it into the 5 gallon jug.
2. Fill the 3 gallon jug again. Finish filling the 5 gallon jug. There will be one gallon in the 3 gallon jug.
3. Empty the 5 gallon jug.
4. Pour the one gallon in the 3 gallon jug into the 5 gallon jug.
5. Fill the 3 gallon jug and pour it into the 5 gallon jug.

12 years ago. Rating: 4
Comment this answer

Flip

I think you and Terryfossil have both gotten it correct using slightly different methods.

commented 12 years ago

PBhoye

Karma: 6170

use d 5litres jug to measure inside d 3ltr it rems 2ltr and repeat d same process again

12 years ago. Rating: 4
Comment this answer

Colleen

why did you go to liters? I though this was about gallons?

commented 12 years ago

bobbyjeo

but if i do the same again then there would be no water left in the jug

commented 12 years ago

Bob/PKB

Huh?

commented 12 years ago

Bob/PKB

Karma: 945575

After considerable thought, this answer isn't the smartest way to accomplish the quest. My other answer makes more sense.

Fill the three gallon jug and pour it into the five gallon jug. Mark the 3 gallon line on the 5 gallon jug. Then calculate where one and two gallons would be. Use a stone to scratch the mark into the side of the jug.
Empty out two gallons from the five gallon jug back into the 3 gallon jug, then add the third gallon to the 3 gallon jug. Pour those 3 gallons into the 5 gallon jug.