Sand Problem

The Problem

Two sandboxes each contain the same amount of sand, but one is filled with black sand and other is filled with white sand. Afreen scoops a full bucket of the black sand and pours it into the white sand. Afreen stirs this mixture for hours (her dad cut off her cell phone) until the black and white sand are perfectly mixed. Afreen then scoops a full bucket of the mixed sand and pours it into the black sand so that both sandboxes once again have the same amount of sand. Which is greater, the amount of black sand added to the white sand or the amount of white sand added to the black sand, or are they equal?

The Solution

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