Required Mathematical Intelligence

Chapter 131 How to Measure 4 Liters of Water

You have two buckets.Capacities are 3 liters and 5 liters, respectively, while still having plenty of water.How can you accurately measure 4 liters of water?
[答案：3升装满，倒入5升桶（5升桶还有2升空间）；3升再次装满，倒入5升桶至满，则3升桶还剩1升；把5升桶的水全倒掉，把3升桶的1升倒入5升桶；3升桶装满倒入5升桶即得4升。]
(End of this chapter)