The larger pile (60 grams) would have more entropy. Entropy is essentially disorder, if you have a larger amount of atoms there's more possible ways that the atoms can be spread around within the pile. Larger possibilities of configurations means more disorder.
delG=delH - delST : Spontaneous reactions have a negative delG, you are given that the reaction is endothermic (positive delH) and has a positive delS. With that being said it's simple algebra. High temperatures will make a negative delG more positive.