15 cutting-edge Google Interview Questions and answers

Question 1: How many golf balls can fill a school bus?(Position: Product Manager)

Analysis: Through this question, Google hopes to test whether job seekers can determine the key to solving the problem.

Answers from netizens: I think a standard-sized school bus is about 8 feet wide, 6 feet tall, and 20 feet long-I can know these figures because I have been stuck behind the school bus for countless times.

It is estimated that the volume of a school bus is about 960 cubic feet, that is, 1.6 million cubic inches. A golf ball has a radius of about 0.85 inch. I think the size of a golf ball is about 2.6 cubic inches.

By dividing the volume of the school bus by the volume of golf balls, the result is 0.66 million. However, because there are seats and other things in the school bus, and the shape of the golf ball makes a lot of gaps between different balls. My final estimation result is 0.5 million. This sounds crazy. If I guess, the answer I give must be less than 0.1 million, but I believe in my mathematics level.
Of course, if the school bus here is the one Mr. Bush sat in that year, the result will be divided by 2, which is about 0.25 million.

Question 2: What is your offer for cleaning all the windows in Seattle?(Position: Product Manager)
Answer: We can play tricks on this question. Our answer is "$10 per window ".

Question 3: There is a country where people only want to have boys. They will continue to have children before they have sons. If the first child is a daughter, they will continue to give birth to a son. What is the proportion of male and female children in this country? (Position: Product Manager)

Answer: This question has caused a lot of controversy, but we found that the answer to this question is as follows:

1. Assume that a total of 10 couples have one child for each couple. The ratio of men to women is equal. (A total of 10 children, 5 male and 5 female );
2. Five couples of girls have five children, with the same proportions of men and women. (A total of 15 children, 7.5 for both men and women );
3. 2.5 of couples who have girls have 2.5 children, with the same proportion of men and women. (There are a total of 17.5 children, and both men and women have 8.75 children );
4. Therefore, the ratio of men to women is.

Question 4: How many piano tuner are there in the world?? (Position: Product Manager)

Answer: Our answer is "depends on the market situation. If the piano needs to be tuned once a week, it takes one hour for each call, and each tuner works for 40 hours a week. We think that every 40 piano would require a tuner ."

This problem is also known as the "Fermi Problem ). The question that Feri asked was "How many piano tuner is there in Chicago ". A typical answer is the multiplication of a series of estimated data. If the estimation is correct, you can get the correct answer. For example, we use the following assumptions:

There are about 5 million people living in Chicago;
Each household has an average of 2 members;
About 1/20 of households have regular piano tuning;
On average, each piano is tuned once a year;
It takes two hours for each tuner to adjust a piano;
Each tuner works 8 hours a day, 5 days a week, and 50 weeks a year.
Through these assumptions, we can calculate the number of piano required for tuning in Chicago every year:
(5 million people in Chicago)/(2 persons/Home) × (1 piano/20) × (1 piano adjustment/1 year) = 125000
The average number of pianos that each tuner can adjust each year is:
(50 weeks/year) × (5 days/week) × (8 hours/day)/(1 piano/2 hours) = 1000

The number of phonograph divisions in Chicago is:

(The number of piano calls required in Chicago is 125,000.)/(each tuner can adjust 1000 of the total number of piano calls per year) = 125

Question 5: Why is the manhole cover on the road round?? (Position: Software Engineer)
Answer: Circular manhole covers will not fall down at any angle.

Question 6: design an emergency evacuation plan for San Francisco(Position: Product Manager)

Answer: This is another question that examines whether a job seeker can discover the core of the problem. Before answering this question, we should first ask what kind of disaster the evacuation plan should address ".

Question 7: The hour and minute of the clock will overlap several times in a day? (Position: Product Manager)

Answer: 22 times.
The overlapping time points are:, and;.

Question 8: Dead beef. (Position: Software Engineer)

Answer: The correct answer provided by netizens is that in the age of mainframe and assembly language, "deadbeef" is a hexadecimal value used for computer debugging, this allows you to mark and search for specific memory data in a large number of hexadecimal interrupt messages. Most computer science graduates should have seen this concept in assembly language courses.

Question 9: what will he do next when someone parked his car out of the hotel and lost his belongings?? (Position: Software Engineer)

Answer: Get off and step onto the sidewalk.

Question 10: Make sure your friend Bob has your correct phone number, but you cannot ask him directly. You need to write down this question on a card, and then hand it over to Eva, who will hand it over to Bob and then tell you the answer. In addition to writing this question on the card, you must also write the question so that Bob won't let Eva know your phone number while giving the answer.? (Position: Software Engineer)

Answer: Now that you only need to check whether Bob's phone number is correct, you just need to ask him to call you at a specific time. If he hasn't called you, you can confirm that he does not have your number.

Question 11th: If you are the captain of a pirate ship, the crew members will vote on the gold allocation plan. If less than half of the votes are in favor, you will be killed. How can you get the most gold while keeping yourself alive?? (Position: Software Engineer)

Answer: Evenly distribute gold to the most powerful 51% of crew members.

Question 12th: there are eight balls of the same size, one of which is slightly heavier than the other. How can I find the different ball in just two times?? (Position: Product Manager)

Answer: Take six of the eight balls and put three on each side of the balance. If you balance, place the remaining two balls on both sides of the balance to find the heavier ball. If the balance is not balanced, the heavier ball is on the sinking side of the balance, and two weights are taken from the three. If the balance is not balanced, the sinking side is heavier. If the balance is on, the remaining part is the heavier ball.

Question 13th: You have two eggs standing in the building on the fifth floor. The eggs may not be broken until they fall down from the roof. They may be fragile and broken when they fall down on the first floor. How many times can I find the highest floor where the eggs will not be broken?? (Position: Product Manager)

Answer: 14 times. Drop the first egg from the 14th floor. If it is broken, perform a layer-by-layer test. A total of 14 tests are required. If it is not broken, go up to 13 floors; the second time on the 27 th Floor, drop the first egg. If it is broken, change the second egg to go up to 12 tests, if it is still not broken, go up to 12 layers to test the first egg, and so on until it reaches Layer 3. If the eggs will break down until the height of Layer 3 falls, a total of 14 attempts are required.

Question 14th: What is database to your 8-year-old nephew in three sentences?? (Position: Product Manager)

Answer: This question examines the ability of job seekers to describe complex concepts in simple languages. Our answer is "database is a machine that can remember a lot of information about many things. People use it to help remember this information. Go out and have fun ."

Question 15th: You are reduced to a coin that is only a little thick and then thrown into an empty glass blender. The blade starts to rotate in a minute. What do you do? (Position: Product Manager)

Answer: This question examines the creativity of job seekers. We will try to break the motor.