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Colin's Score (John's Score in the UK version) is a puzzle in Professor Layton and the Diabolical Box.

Puzzle

Four students took a test where every question had two possible answers, A or B. Each question was worth 10 points, for a total of 100 points.

US Version

The students' test results were posted as seen below, but the teacher forgot to tally Colin's score. Colin was heading to the teacher's office when Mary called him back, saying they could figure out his score using the results from the other tests. Can you figure out Colin's score?

UK Version

The students' test results were posted as seen below, but the teacher forgot about John's score. John was heading to the teacher's office when Mary called him back, saying they can determine his score using the results from the other tests. Can you work out John's score?

Hints




Click a Tab to reveal the Hint.

US Version

This is a hard puzzle, so maybe this hint will help. The first thing you need to do is create an answer key based on the three scored tests.

Since Mary got the highest score, try creating a key that compares her answers to everyone else's.

UK Version

To solve this puzzle, you'll need to work out what are the correct answers to the 10 questions. The easiest way to do this is to create a chart showing the potential correct answer for each question, compare it to the test results and adjust it so that it matches each person's score. Since Mary got seven questions right, her answers should be the starting point for your answer key. Pay attention to where her answers differ from everyone else's.

US Version

The three graded tests agree on four questions. However, you know that not all four of these are correct because Lisa only got a score of 30. You also know that not all of these "agreed" answers are incorrect because Mary had a score of 70.

UK Version

Are you finding it hard to find the correct answers? Using some common sense can give you a head-start. If all four students answered a question in the same way it's quite likely that it's the correct answer, isn't it?

US Version

You can make multiple answer keys that will all yield the same results. As long as you find one of these keys, you can solve this puzzle.

UK Version

You'll have noticed that all four people agreed on an answer for four questions. They can't all be correct, though, since Lisa only got 30 points. Let's assume that three of them are correct, then...


Solution

Incorrect

Too bad!

You need to narrow down the conditions. This puzzle's a tough one.

Correct

A+!

US Version

An A+ for you, that is. Unfortunately for Colin, his score was 60 points.

Based on the results from the three scored tests, you could come up with four possible answer keys, labeled here as A through D. No matter which one you use, Colin's score is 60!

UK Version

An A+ for you, that is. Unfortunately for John, his score was 60 points.

Based on the results from the three scored tests, you could come up with four possible answer keys as shown. No matter which one you use, John's score is 60!

DB151S

A big thanks to http://professorlayton2walkthrough.blogspot.com

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