2 pennies answer
Take 1 bar each from bags 1-4, 2 bars from bag 5, and 3 bars from bag 6, and weigh these together. This will weigh at most 93 oz. If bags 5 or 6 are gold, we will find this immediately since the weight will be 93 for bag 6 and 92 for bag 5. If it weighs 91, we know one of the bags 1-4 is gold. If it weighs 90, we know none of these 4 are gold, so one of bags 7-10 are gold. In either case, we have 4 bags left to check. Set one of the 4 bags aside, and take 1+2+3 bars from the other 3 bags and weigh these together. This will be at most 63 oz, and will uniquely identify the gold bag.
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