Question

the company had about 20 notbook computers but only one- third ________ used regularly.Now we have

the company had about 20 notbook computers but only one- third __were______ used regularly.Now we have 60working all day long.为什么用复数？？不是小于一吗

谢谢了

Answer 1

one-third 后面省略了（of them），指20台笔记本中的约1/3，算下来应该是6-7台，因此要用复数。
全句：公司以前有大约20台笔记本电脑，但只有1/3经常使用。现在我们有60台全天候使用。