Label the coins from the first set of five A,B,C,D,E and the coins from the second set F,G,H,I,J. Weigh ABCF/DEGH.
If ABCF>DEGH then one of A,B,C is a fake and one of F,I,J is a fake. Weigh A/B and I/J to determine which.
If ABCF=DEGH then the fakes are (AG),(AH),(BG),(BH),(CG),(CH),(DF), or (EF). Weigh G/H.
If one of G or H is a fake then one of A,B,C is the other fake. Weigh A/B to determine which.
If G=H then F is a fake and one of D and E is a fake. Weigh D/E to determine which.
If DEGH>ABCF then one of D and E is a fake and one of G,H,I,J is a fake. Weigh DG/EH.
If DG>EH then D is a fake and one of G,I,J is a fake. Weigh I/J to determine which.
If EH>DG then E is a fake and one of H,I,J is a fake. Weigh I/J to determine which.
If DG=EH then either D and H are the fakes or E and G are the fakes. Compare the two pairs to determine which. |