Water From 3 Jugs Into Two Pools
Logic puzzles require you to think. You will have to be logical in your reasoning.
You have:
 two 10liter jugs, full of water
 one 9liter jug, empty
 two large pools, empty
Your objective is to end up having 4 liters of water in each pool, and one liter of water in the 9liter jug.
You have nothing else at your disposal and you can not measure using eye or shape of jugs. You can not pour water from pools, only into them.
HintThis needs 29 steps to fill two pools with 4liters, and an additional 4 steps to get 1 liter in the 9liter jug, for a total of 33 steps.
Hide
Answer
Label the 10liter jugs as A and B, the 9liter jug as C, and the two pools as Pa and Pb. The problem can be solved in 33 steps, as shown below. Each step is shown in one row, starting with the step number, followed by the jug we poured water from, then the quantity of water, then the jug/pool we poured water into... i.e. A >( 1)> Pb means we poured 1 liter of water from jug A (being 1st 10liter jug) to pool Pb (being 2nd pool). Finally in the row we show how much water we have in each jug/pool after performing this step.

#: From > Qty > To = A B C Pa Pb

0: _____________ = 10 10 0 0 0
1: A >( 9)> C = 1 10 9 0 0
2: A >( 1)> Pa = 0 10 9 1 0
3: C >( 9)> A = 9 10 0 1 0
4: B >( 9)> C = 9 1 9 1 0
5: B >( 1)> Pa = 9 0 9 2 0
6: C >( 1)> A = 10 0 8 2 0
7: C >( 8)> B = 10 8 0 2 0
8: A >( 9)> C = 1 8 9 2 0
9: A >( 1)> Pa = 0 8 9 3 0
10: C >( 9)> A = 9 8 0 3 0
11: A >( 2)> B = 7 10 0 3 0
12: B >( 9)> C = 7 1 9 3 0
13: B >( 1)> Pa = 7 0 9 4 0
14: C >( 3)> A = 10 0 6 4 0
15: C >( 6)> B = 10 6 0 4 0
16: A >( 9)> C = 1 6 9 4 0
17: A >( 1)> Pb = 0 6 9 4 1
18: C >( 9)> A = 9 6 0 4 1
19: A >( 4)> B = 5 10 0 4 1
20: B >( 9)> C = 5 1 9 4 1
21: B >( 1)> Pb = 5 0 9 4 2
22: C >( 5)> A = 10 0 4 4 2
23: C >( 4)> B = 10 4 0 4 2
24: A >( 9)> C = 1 4 9 4 2
25: A >( 1)> Pb = 0 4 9 4 3
26: C >( 9)> A = 9 4 0 4 3
27: A >( 6)> B = 3 10 0 4 3
28: B >( 9)> C = 3 1 9 4 3
29: B >( 1)> Pb = 3 0 9 4 4
30: C >( 7)> A = 10 0 2 4 4
31: C >( 2)> B = 10 2 0 4 4
32: A >( 9)> C = 1 2 9 4 4
33: C >( 8)> B = 1 10 1 4 4
After the 33rd step we end up with 4 liters in each pool (Pa and Pb), and 1 liter in the 9liter jug (C), as requested in the problem.
Hide
Back to Top
 

Follow Braingle!