喜欢算术的读者现在能回答一个进一步的问题：外国持有的联邦债务比例是多少？

Readers who enjoy arithmetic can now answer a further question: what proportion of the federal debt is owed to foreigners?

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2005年，全州83%、80%和68%的八年级学校(约13岁)通过了阅读、国语和算术考试；到2009年，这一比例提高到93%、92%和70%。

In 2005, 83%, 80% and 68% of the state's eighth-grade (roughly, 13-year-old) pupils passed reading, language-arts and maths tests; by 2009, those Numbers had risen to 93%, 92% and 70%.

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但是当这些鱼识别2倍的数量比例时算术能力瓦解了—对于人类志愿者也有同样的效果。

But numerical skills break down for the fish when the ratios between two Numbers change-an effect that was also seen among human volunteers.

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