Puzzle 197
What 5-digit number am I thinking of?
It has two prime digits.
Digit 3 is the highest digit.
Digit 2 is the lowest digit.
Digit 1 is higher than the sum of digits 4 and 5.
Digit 5 is half of digit 4.
Digit 1 is one smaller than digit 3.
Digit 5 is between digit 2 and digit 1
The digit 0 doesn't appear, and there are no duplicates. Don't forget that 1 isn't prime, the prime numbers start with 2, 3, 5…
Puzzle Copyright © Kevin Stone
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Hint
What can digits 4 and 5 be?
Answer
71842.
Reasoning
The number can be represented as:
- - - - -
By (5), Digit 5 is half of Digit 4, so we have four possibilities:
- - - 2 1
- - - 4 2
- - - 6 3
- - - 8 4
By (4), Digit 1 is higher than the sum of Digit 4 and Digit 5, so we can eliminate two possibilities, leaving:
- - - 2 1
- - - 4 2
By (7), Digit 5 is between Digit 2 and Digit 1, so we can eliminate - - - 2 1, leaving:
- - - 4 2
By (4), Digit 1 must be higher than the sum of Digit 4 and Digit 5, so we have three possibilities:
7 - - 4 2
8 - - 4 2
9 - - 4 2
By (6), Digit 1 is 1 smaller than Digit 3 we can eliminate 9 - - 4 2, and fill in Digit 3, leaving:
7 - 8 4 2
8 - 9 4 2
By (3), Digit 2 is the lowest digit, and must be 1:
7 1 8 4 2
8 1 9 4 2
By (1), the only possibility is:
7 1 8 4 2
Puzzle 198
At the local play group for babies and toddlers, I was asking about the number of teddies each of child had.
The four children are aged 1, 2, 3 and 4.
Remarkably, the children have one, two, three and four teddies, although not necessarily respectively.
Dale has more teddies that their age. Jesse is older than Morgan. Curiously only one child has the same number of teddies as their age. Pat has fewer teddies than Jesse and the child aged 3 has two teddies. Pat is the youngest.
Can you determine who has which teddies?
Puzzle Copyright © Kevin Stone
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Hint
Jesse is the oldest.
Answer
Morgan is 3 and has two teddies.
Pat is 1 and has one teddies.
Jesse is 4 and has three teddies.
Dale is 2 and has four teddies.
Puzzle 199
I am compiling the new BrainBashers world almanac, and it now contains lots more pages.
I know that it takes 333 digits to print the page numbers in sequence.
How many numbered pages does the book have?
How many times does the number 3 appear?
Puzzle Copyright © Kevin Stone
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Hint
Think of the pages from 1-9, and then 10-99.
Answers
There are 147 pages.
The number 3 appears 35 times.
Answer #1
For pages 1-9, there are 9 pages, which is 9 digits.
For pages 10-99, there are 90 pages, which is 180 digits.
This is a total so far of 189, therefore we require another 333 – 189 = 144 digits, which is another 144 ÷ 3 = 48 pages.
Taking us to 9 + 90 + 48 = 147 pages in total.
Answer #2
From page 1 to 147 we have 15 pages that end in 3:
3, 13, 23, ..., 143
We also have the ten pages that start with 30:
30, 31, 32, ..., 39
Plus the ten pages that start with 130:
130, 131, 132, ..., 139
For a total of 15 + 10 + 10 = 35 number 3's.
Puzzle 200
Chess Contest - Logic Puzzles
At the local games evening, four friends were competing in the chess and croquet competitions.
Frankie beat Glen in chess, Dale came third, and the 16-year-old won.
Frankie came second in croquet, the 15-year-old won, Dale beat the 18-year-old, and the 19-year-old came third.
Emery is 3 years younger than Glen.
The person who came last in chess came third in croquet, and only one person got the same position in both games.
Can you find the ages of the people and their positions in the two games?
Puzzle Copyright © Kevin Stone
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Hint
How old could Glen be?
Answer
Name Age Chess Croquet
Dale 15 3 1
Emery 16 1 4
Frankie 18 2 2
Glen 19 4 3
Reasoning
The possible ages are: 15, 16, 18, 19.
Breaking the clues down, and numbering them:
Frankie beat Glen in chess.
Dale came third (chess).
The 16-year-old won (chess).
Frankie came second in croquet.
The 15-year-old won (croquet).
Dale beat the 18-year-old (croquet).
The 19-year-old came third (croquet).
Emery is 3 years younger than Glen.
The person who came last in chess came third in croquet.
Only one person got the same position in both games.
By (4), Frankie came 2nd in croquet.
Name Age Chess Croquet
Dale
Emery
Frankie 2
Glen
By (2), Dale came 3rd in chess.
Name Age Chess Croquet
Dale 3
Emery
Frankie 2
Glen
By (8), Emery is 15 or 16, and Glen is 18 or 19.
By (9), the person who came 4th in chess, came 3rd in croquet, and by (7), they are 19. This can't be Dale (3rd in chess), or Frankie (2nd in croquet), or Emery (aged 15 or 16), so it must be Glen.
Name Age Chess Croquet
Dale 3
Emery
Frankie 2
Glen 19 4 3
By (6), Dale can't have been 4th in croquet, so must be 1st. Leaving Emery in 4th.
Name Age Chess Croquet
Dale 3 1
Emery 4
Frankie 2
Glen 19 4 3
By (10), only one person got the same position in both games, this can't be Emery 4th in both (as Glen is already 4th in chess), so must be Frank, 2nd in both. Leaving Emery 1st in chess.
Name Age Chess Croquet
Dale 3 1
Emery 1 4
Frankie 2 2
Glen 19 4 3
By (3) and (5) we know the ages of the winners in each competition, and Frankie is therefore 18.
Name Age Chess Croquet
Dale 15 3 1
Emery 16 1 4
Frankie 18 2 2
Glen 19 4 3
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