18
Problem or Puzzle Questions
A handful of employers make a practice of asking problem or puzzle questions during
an interview. These are usually done to test logical thinking skills, intelligence, and your
ability to think on your feet and solve problems under stress. The eectiveness of this
type of interview is in doubt, however, and it is rarely used.
Problem or puzzle questions usually fall into three categories:
1. Those with a correct answer. Example: There are three ants at the three corners
of a regular triangle. Each ant starts moving on a straight line toward another,
randomly chosen corner. What is the probability that none of the ants collide?
(The correct answer, by the way, is one in four. Can you figure out why?)
2. Those with no correct answer but with a recommended approach. Examples:
How many gas stations are there in the United States? Design a spice rack for a
person who is blind. The interviewer is looking at how you approach the ques-
tion. Does your approach provide a reasonable way to view the problem and
lead to an approximate solution? On the gas station problem, you might start
with the population of the United States, estimate the number of vehicles, es-
timate the number of vehicles served by the average gas station, and come up
with an answer.
3. Those with no correct answer that test the imagination. Examples: If you could
be a breakfast cereal, what would you be? What would you like to be the epitaph
on your gravestone? Responses to these questions would be dicult for a psy-
chologist to interpret. The best advice in handling them is to try to show some
imagination or positive attributes: “My breakfast choice would be Special K be-
cause it’s part of a good nutrition team.”
These types of questions are not common but can be very important. Don’t start talk-
ing right away. Think the question through and organize your thoughts. Ask clarifying
questions and make sure you get as much information as you can. Finally, don’t be
frivolous or make wisecracks about the question.
Case Interview
The case interview process is typically used by management consulting firms, law firms,
counseling and social work organizations, and police departments. Employers use the
case interview to help them understand your thought process and evaluate how you
might handle certain situations under pressure. In a case interview, you will likely be
presented with a dilemma and asked to analyze the situation, identify the main is-
sues, and discuss how you would solve the problem. Interviewers ask case questions to
see how well you listen, think and use logic behind your thoughts, and articulate your
thoughts under pressure.
Your job during the case interview is to become the professional in the situation pre-
sented to you by the interviewer. You must ask questions to clarify the facts, explore
the bigger picture, think about all the issues, and then come to a conclusion. There is
really no right or wrong answer; you are being evaluated on the process you use to
structure a competent approach and come up with an appropriate solution.