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I'm going to say.....40C. Since if either were the same mass it would be 60 evened out, but since there is 2x as much water, the difference 40 is halved into 20, so that the outcome is 40 (20 + 20). I don't think you even need to use the equation; the entropy of the iron should be linear and predictable. Just a guess based on logic and no math. Very Happy If I'm right, I'll feel allot more confident about by logical guessing skills. Smile

You have to take in to acount the heat capacity of the two substances.