Puzzle | Measuring 6L water from 4L and 9L buckets

Suppose you have a 4-litre jug and a 9-litre bucket, both without any measurement markings. How can you measure exactly 6 litres using only these two containers and an unlimited supply of water?

Check if you were right - full answer with solution below.

Solution:

Consider two containers: a 4-litre jug and a 9-litre bucket, and use them to measure exactly 6 litres of water with an unlimited water supply.

Step 1: Fill the 9-litre bucket completely.

Step 2: Pour water from the 9-litre bucket into the 4-litre jug until it is full.

Step 3: Empty the 4-litre jug.

Step 4: Pour water from the 9-litre bucket into the 4-litre jug again until it is full.

Step 5: Empty the 4-liter jug.

Step 6: Pour the remaining 1 liter from the 9-liter bucket into the 4-liter jug.

Step 7: Refill the 9-liter bucket completely.

Step 8: Pour water from the 9-liter bucket into the 4-liter jug until it is full (it will take 3 liters).

Step 9: You are now left with exactly 6- liters in the 9-liter bucket.