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Balance Your Books (Balance your Books in the UK version) is a puzzle in Professor Layton and the Unwound Future.
Puzzle
- US Version
You recently bought several rare books at a used-book store. The total you paid, before tax, was 99 pounds.
The image below shows the shelf you purchased your books from. Below each book is a tag listing its price, also before tax. Which books did you buy?
Mark all the books you bought before submitting your answer.
- UK Version
You recently bought some rare books at a second-hand bookshop. The total you paid was £99.
The image below shows the shelf from which you selected your books. Below each book is a tag listing its price. Which books did you buy?
Tick all the books you bought and then touch Submit.
Hints
Solution
Incorrect
Too bad!
- US Version
Double-check your math, and try again.
- UK Version
Double-check your calculations and try again.
Correct
Right on the money!
- US Version
You bought four books with prices of 27, 33, 15, and 24 pounds. Identifying the numbers that add up so that the second digit is nine is a common approach to solving this type of problem.
By the way, 99 is a multiple of three. Did you notice that if you choose only books whose prices are multiples of three, you also got the right answer?
- UK Version
You bought four books, priced at £27, £33, £15 and £24. Identifying the numbers that add up so that the second digit is nine is the most common approach to solving this puzzle.
By the way, 99 is a multiple of three. Did you notice that the price of every book you chose also happens to be a multiple of three?
Trivia
In this puzzle, the price labels are missing the pound sign (£) in the UK version.
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