Francisco’s MP3 player with a capacity of 64 gigabytes (GB) was three-quarters full

题目

Francisco’s MP3 player with a capacity of 64 gigabytes (GB) was three-quarters full. He then deleted 25% of the data saved on the device before saving another 20 GB of new data to the device. The resulting amount of data saved is what percent of the capacity of Francisco’s MP3 player?

选项

62.5 %

70 %

75 %

87.5 %

95 %

解析

如果弗朗西斯科的MP3播放器容量为64GB，且已用了四分之三，那么当前已用容量为 3/4×64 GB = 48 GB.。然后他删除了这些数据的25%，也就是12GB，此时已用数据量减少到 48 – 12 = 36 GB。在保存了20GB的新数据后，设备中存储的数据总量为 36 + 20 = 56 GB。这占总容量的 56/64×100=87.5%。

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