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**4 bottles and water puzzle**

There are two bottles of 10 liter; each completely filled with water. Now 2 persons having empty bottles of 4 liter and 5 liter want to take 2-2 liters of water. You can use only these 4 bottles (10 liter-full, 10 liter-full, 5 liter-empty, 4 liter-empty) to transfer the water. Wasting or throwing of water is not permitted. How can this be done?

Note: It is assumed that you can not measure water level by comparing water level, or by judging, it should be exact 2 liters of water finally in each 4 and 5 liter water bottle.

Answer:

This puzzle is courtsey Kranthi Kumar, shared on our facebook page.

WATER BOTTLES | FIRST 10 LITER WATER BOTTLE | SECOND 10 LITER WATER BOTTLE | 4 LITER WATER BOTTLE | 5 LITER WATER BOTTLE |
---|---|---|---|---|

Initial State |
10 | 10 | 0 | 0 |

fill 5 liter bottle comppletely | 10 | 5 | 0 | 5 |

fill 4 liter bottle completely from 5 liter bottle | 10 | 5 | 4 | 1 |

empty 4 liter bottle to 2nd 10 liter bottle | 10 | 9 | 0 | 1 |

transfer remaining 1 liter water from 5 liter bottle to 4 liter bottle | 10 | 9 | 1 | 0 |

again fill 5 liter bottle from 2nd 10 liter bottle | 10 | 4 | 1 | 5 |

fill 4 liter bottle completely from 5 liter bottle, it already had 1 liter water | 10 | 4 | 4 | 2 |

empty 4 liter bottle to 2nd 10 liter bottle | 10 | 8 | 0 | 2 |

fill 4 liter bottle with first 10 liter bottle | 6 | 8 | 4 | 2 |

fill 2nd 10 liter bottle from 4 liter bottle | 6 | 10 | 2 | 2 |