# i was asked a riddle and i cant crack it!!! so please help… 10 gold coins and 1 counterfeit?

there are 10 gold coins from that 1 is a counterfeit we don’t know if the fake one is heavier or lighter than the gold coins and you get only 3 readings on the scale to solve it.

P.S. all the coins look identical. the only difference is the fake one is either heavier or lighter than the original. and all the other 9 original coins weigh the same!

its not 12 its 10 (the 12 i read on google the one i was asked is 12!!)

its not 12 its 10 (the 12 i read on google the one i was asked is 10!! IM SURE!!!)

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i think you mean 12 gold coins.

1. Weigh 6 vs 6.

Take the 6 that weigh less.

2. Weigh 3 vs 3.

Take the 3 that weigh less.

3. Weigh 1 vs 1.

If one weighs less it’s the counterfeit. If both weigh the same, the one you didn’t weigh is the counterfeit.

howdy patner!

1. Weighing X, ABCD — EFGH set aside I and J

12. X balanced, weighing Y1, I — J

12a. X balanced, Y1 tilted, the odd coin is I or J

12a3. Weighing Z1, J — A set aside I

12a3a. Z1 balanced, the odd coin is I and weight is determined by Y1

12a3b. Z1 tilted, the odd coin is J and weight is determined by Y1 or Z1

12b. X tilted, weighing Y2, ABG — CEI set aside D, F, and H

12ba. X tilted, Y2 balanced, the odd coin is D, F, or H

12ba3. Weighing Z2, F — H set aside D

12ba3a. Z2 balanced, the odd coin is D and weight is determined by X

12ba3b. Z2 tilted opposite X, the odd coin is F and weight is determined by X or Z2

12ba3c. Z2 tilted same as X, the odd coin is H and weight is determined by X or Z2

12bb. X tilted, Y2 tilted opposite as X, the odd coin is C or G

12bb3. Weighing Z3, C — I set aside G

12bb3a. Z3 balanced, the odd coin is G and weight is determined by X or Y2

12bb3b. Z3 tilted, the odd coin is C and weight is determined by X, Y2, or Z3

12bc. X tilted, Y2 tilted same tilt as X, the odd coin is A, B, or E

12bc3. Weighing Z4, A — B set aside E

12bc3a. Z4 balanced, the odd coin is E and weight is determined by X or Y2

12bc3b. Z4 tilted opposite X and Y2, the odd coin is B and weight is determined by X, Y2, or Z4

12bc3c. Z4 tilted same as X and Y2, the odd coin is A and weight is determined by X, Y2, or Z4