1. how can you measure out exactly 4 litres of water tap using 3 litre and 5 litre of buckets?
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first fill the 5lt bucket, then pour this water into 3lt bucket.. then we have 2lts of water in 5lts bucket.then empty the 3lts bucket, again fill with 2lts of water which is in 5lts bucket. now we have 2lts of water in 3lts bucket. now again fill the 5lts bucket, then pour this water in to 3lts bucket up to complete..i.e it takes one lt water. now we have 4 lts of water in 5lts bucket.