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

这个问题的目的在于测试求职者的近似值估算能力以及他们的空间分析能力。

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.

解决这个问题的方法就得综合一系列的估算才能得出正确答案。因此求职者可能需要估算不同的因素，比如有多少家庭家里有钢琴，他们给钢琴调音的频率，以此得出一年的钢琴调音次数。

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

然后他们还得计算每位钢琴调音师的平均工作时间以及他们所完成的工作数量。

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

每年给钢琴调音的次数除以每年每位钢琴调音师就能得出最终答案。

Google candidates going for a role as product manager also used to be asked: 'How many golf balls can fit in a school bus?

应聘Google产品经理的求职者也曾被问过这样的问题：“要使用多少个高尔夫球才能填满一辆校巴？”

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