Multiple Choice

In a staff training workshop on inventory management, a trainer uses a counter model to demonstrate that $8 - (-5) = 13$. The trainer starts with 8 blue counters (surplus) and adds 5 neutral pairs (each containing one blue and one red counter) so that 5 red counters (deficit) can be removed. According to the mechanics of this model, what is the specific reason the final count of blue counters becomes 13?

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Updated 2026-04-21

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