Say the coins are marked 1-12 (or you order them on the table to indicate such)
Weigh as follows and note which way the scale tips:
Weigh 1: 1,2,3,4 against 5,6,7,8
Weigh 2: 1,2,3,6 against 4,9,10,11
Weigh 3: 1,4,7,10 against 2,5,9,12
If the scale weighs (R for right or L for left):
LLL or RRR - It is coin 1 LLR or RRL - It is coin 2 LLE or RRE - It is coin 3 LRL or RLR - It is coin 4 LEL or RER - It is coin 5 LRE or RLE - It is coin 6 LER or REL - It is coin 7 LEE or REE - It is coin 8 ELL or ERR - It is coin 9 ELR or ERL - It is coin 10 ELE or ERE - It is coin 11 EEL or EER - It is coin 12
Dear Spy,
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Say the coins are marked 1-12 (or you order them on the table to indicate such)
Weigh as follows and note which way the scale tips:
Weigh 1:
1,2,3,4 against 5,6,7,8
Weigh 2:
1,2,3,6 against 4,9,10,11
Weigh 3:
1,4,7,10 against 2,5,9,12
If the scale weighs (R for right or L for left):
LLL or RRR - It is coin 1
LLR or RRL - It is coin 2
LLE or RRE - It is coin 3
LRL or RLR - It is coin 4
LEL or RER - It is coin 5
LRE or RLE - It is coin 6
LER or REL - It is coin 7
LEE or REE - It is coin 8
ELL or ERR - It is coin 9
ELR or ERL - It is coin 10
ELE or ERE - It is coin 11
EEL or EER - It is coin 12
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