‘Move 1 digit so that 62 – 63 = 1 makes it true’ and ‘Find a way to keep 1 + 1 + 1 = 13 from going wrong’
In the current recruitment process, most companies have a face-to-face (or online) interview round to assess candidates’ qualifications. Referring to recruitment questions, it is impossible not to mention Apple – a technology giant that specializes in giving “brain-twisting” interview questions.
Typically, Apple will ask hiring questions that are both technical (based on the candidate’s past experience) and incorporate some trivia to see how responsive they are.
For example, if you’re applying for a position as an employee at a retail store, you’ll have to answer a lot of questions about how to deal with a disgruntled customer.
A few years ago, Business Insider compiled a number of recruitment questions that candidates who interviewed at Apple shared on the Glassdoor platform. In it, there are 2 math questions that are of great interest to many people.
Sentence #1: “62 – 63 = 1; move only one digit, make this calculation true”. This is a question for a Software Development Engineer candidate.
Many new readers will think that simply turning the minus sign into an equal sign (62 = 63 – 1) but that is not the correct answer because the question asks to move “a digit” and not a “sign”.
The answer to this question is to turn 62 into 26 (2 to 6 = 64), subtract 63, resulting in 1.
Question 2: “1 + 1 + 1 = 13, how to make the above calculation correct?”. This is not an easy question, but it is incredibly easy. Many people struggle to find a way to turn 1 into 11 (11 + 1 = 13), but it is still incorrect and there is a plus sign left.
The answer to this question is to add a slash so that the equal sign turns into another sign. Thus, 1 + 1 + 1 # 13, makes perfect sense.
In addition to the above two questions, Apple also offers many other “puzzle” questions for candidates. Here are a few of them:
Software engineer candidate: “There are 100 coins mixed up on the table, of which 10 are heads and 90 are heads. You never know which coins are heads or tails and are not allowed to touch or look at the coins. How to divide those 100 coins into 2 parts with the same number of heads?”.
Software quality management engineer candidate: “There are 3 boxes, 1 box containing apples, 1 box containing oranges and 1 box containing both apples and oranges. All 3 boxes are mislabeled and cannot be distinguished from the inside. You can only open 1 box, not look inside and take out only 1 fruit. “.
Civil engineer candidate: “Are you smart?”.
Solution consultant candidate: “How much does the Empire State Building weigh?”.
Retail Candidate: “Which superhero would you choose and why?”.
Apple Genius Candidate: “Explaining the concept of what RAM is to a 5-year-old”.
Product Design Engineer Candidate: “We have a cup of hot coffee and a glass of cold milk that just came out of the fridge, let them come to room temperature. When should we add milk to the coffee to get it right? the best combination? From the beginning, wait a while or wait longer?”.
System engineer candidate: “How do airplane wings work?”.
Hardware engineering candidate: “State 5 ways to measure the amount of gas remaining in a car”.
Software engineer candidate: “If you have 2 eggs and want to find out which is the highest floor from which the egg does not break when dropped, what will you do? What is the most optimal solution?”.
Global Supply Manager candidate: “How many babies are born every day?”.
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