2 1/2 rolls equals 5 halves. A half roll gets used every three packages. So Marcella will wrap 15 packages to get through 2 1/2 rolls.
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Q: For every 3 packages that Marcella wraps,she uses 1/2 of a roll of wrapping paper.If she uses 2 1/2 rolls of wrapping paper,how many packages has she wrapped?