Posted by kayla on .
You have 3 measuring spoons. Spoon A is filled with 8 tsps of salt. Spoon B and C are both empty; Spoon B can hold 5 tsps and Spoon C can hold 3 tsps. Divide the salt among the spoons so that spoon A and spoon B each have exactly 4 tsps of salt and spoon c is empty.

puzzle (math, psychology) 
economyst,
1) fill C from A  A=5, B=0, C=3
2) fill B from C  A=5, B=3, C=0
3) fill C from A  A=2, B=3, C=3
4) fill B from C  A=2, B=5, C=1
5) fill A from B  A=7, B=0, C=1
6) fill B from C  A=7, B=1, C=0
7) fill C from A  A=4, B=1, C=3
8) fill B from C  A=4, B=4, C=0
tada 
puzzle (math, psychology) 
Brandon,
Wow, look at you go! How did you do that economyst?!

puzzle (math, psychology) 
economyst,
Its just logic. Plus it helps if you have seen the problem before.