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A Chinese company has sparked online debate after posing a seemingly straightforward interview question—“If a hen lays five eggs in a week, how many does it lay in a month?”—and immediately rejecting a candidate who answered 20. The incident, reported by local media in early June 2025, reveals that the real test was not arithmetic but critical thinking, adaptability, and the ability to challenge assumptions.
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The Question That Tripped Up a Math Mind
During a hiring session at an unnamed Chinese firm, interviewers presented three candidates with the same query: “A hen lays five eggs per week. How many eggs does it produce in one month?” On the surface, the problem appears to belong in a primary school workbook. Yet the responses—and the company’s reactions—told a far more complex story.
The first candidate reacted with a dismissive laugh, showing what the interviewer later described as a poor attitude. Without receiving a chance to answer, he was immediately ruled out.
The second candidate treated the question as a straightforward calculation. “Five eggs per week multiplied by four weeks equals 20 eggs,” he said, confident in his math. The interviewer listened without comment and moved on. That candidate was not selected.
The Winning Answer: No Standard Answer
The third candidate took a different approach. Rather than offering a single number, he responded that the question had “no standard answer.” He explained that a month could span more than four weeks, that a hen’s health and environment could affect egg production, and that actual output might vary—sometimes falling below five eggs per week. His answer acknowledged uncertainty and complexity, and he was offered the job.
According to the company’s recruiter, the third candidate demonstrated flexible thinking and the ability to consider multiple variables. “He did not lock himself into a rigid formula,” the recruiter told Chinese news outlet China Times. “He looked beyond the obvious and showed logical reasoning under ambiguity.”
Why Critical Thinking Matters More Than Calculation
Human resources experts point out that this type of “creative” or “stress” interview question is increasingly common in competitive job markets, particularly in technology, consulting, and management roles. The goal is not to find a correct numeric answer but to observe how a candidate processes ambiguous information, handles pressure, and communicates reasoning.
“Many roles require staff to deal with incomplete data and changing circumstances,” says Hong Kong-based career coach Mandy Lo. “A candidate who simply memorises formulas or sticks to one interpretation may struggle in dynamic environments. The ability to question the premise and adapt is often more valuable than speed of calculation.”
Broader Implications for Job Seekers
For those preparing for interviews, the takeaway is clear: employers are increasingly measuring cognitive flexibility alongside technical skills. Candidates are encouraged to think aloud, consider edge cases, and demonstrate awareness of real-world limitations—even for questions that seem trivial.
The “hen and eggs” puzzle joins a growing list of unconventional interview questions that have gone viral, alongside classics such as “Why are manhole covers round?” and “How would you explain this product to a five-year-old?” These questions are designed to reveal personality, problem-solving style, and cultural fit.
Next Steps and Resources
Job seekers looking to sharpen their interview skills can practise with similar logic-based and creative questions, focusing on structured reasoning and clear communication. Online platforms such as Glassdoor and LinkedIn often feature real interview questions submitted by candidates, offering valuable insight into what companies seek.
For those curious about other head-scratching interview scenarios, our related articles explore how one candidate secured a job by humorously answering “Is a dumpling male or female?” and another who was rejected for answering “50 yuan” to a simple egg-pricing puzzle.