The riddle is known as a Fermi problem, named after the physicist Enrico Fermi who was known for his ability to make good calculations with very little information or even none.

这类谜题被称为“费米问题”，命名来自物理学家恩里科·费米，他之所以声名远扬是因为他能够在少量的给定信息甚至没有信息的情况下进行运算。

Its purpose is to test a candidates approximation skills as well as their ability at dimensional analysis.

费米问题意在考察应聘者的估算能力以及量纲分析能力。

The puzzle is solved by multiplying a series of estimates to get to the right answer. So a candidate would have to estimate factors such as how many households have a piano, how often they are tuned to figure out how many piano tunings take place a year.

解决费米问题的方法在于通过一系列估算而无限接近正确答案。因此，应聘者需要考量一些因素，诸如：拥有钢琴的家庭户数，此类家庭进行钢琴调音的频次等，从而得出每年有多少次的钢琴调音。

They then need to calculate the average working hours of a piano tuners and the number of jobs they carry out.

随后，应聘者们需要估算出钢琴调音师的平均工作时长以及工作量。

The number of piano tunings that take place per year divided by the number per year per piano tuner should yield the answer.

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