A person wants to download episodes of a favorite TV show to their cell phone.

This problem tests unit rate reasoning and multiplication. Each 20-minute episode uses 0.3 GB. First, determine how many 20-minute episodes can fit into 9 GB. Divide total space by space per episode: 9 ÷ 0.3 = 30 episodes. Next, convert episodes to minutes. Each episode is 20 minutes, so multiply: 30 × 20 = 600 minutes. Therefore, the maximum number of minutes that can be downloaded is 600 minutes, making option D correct. Option A (500 minutes) is close but incorrect. Options B and C underestimate the capacity. NEX questions like this often require identifying a “per unit” relationship first (GB per episode), then scaling to the total allowed amount. Paying attention to the phrase “at most” ensures you calculate the maximum possible value without exceeding the limit.

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