Suppose the mass of a jelly bean is less than the mass of a gum drop. If you counted out 10 of each kind of candy and measured the mass of each kind of candy, the mass of the jellybeans would be

Each jelly bean has less mass than each gum drop. With 10 of each, the total mass of the jelly beans is still less than the total mass of the gum drops, because the same number of lighter and heavier candies are being compared. The correct choice is “less than the mass of the gumdrops.”

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