Puzzle 1
What comes next in this sequence:
dog · cat · mouse · mole · deer · pig · ?
Choose from:
llama, cow, rabbit, frog
Puzzle Copyright © Kevin Stone
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Hint
The list is related to numbers.
Answer
Llama.
The length of each word is the same length as the numbers one, two, three, four, five, six, etc.
The next number is SEVEN, which has 5 letters, and llama is the only word with 5 letters.
Puzzle 2
What comes next in this sequence:
Puzzle Copyright © Kevin Stone
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Answer
Reasoning
Each letter appears as many times as there are straight lines in that letter.
The letter H has three straight lines, so three H's are shown.
Puzzle 3
Can you find a 5-digit number …
… whose digits add up to 18 and whose product is 210 and the digits increase from left to right in the number?
Puzzle Copyright © Kevin Stone
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Hint
Break down 210 into its factors.
Answer
12357.
Reasoning
Since 210 = 2 x 3 x 5 x 7, 12357 is the only way to get a 5-digit number, in ascending order.
Puzzle 4
What is the next number in this sequence:
1 · 1 · 2 · 4 · 3 · 9 · 4 · 61 · 5 · 52 · 6 · 63 · 7 · 94 · 8 · ?
Puzzle Copyright © Kevin Stone
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Hint
Can you see 1, 2, 3, …?
Answer
46.
Reasoning
Take the numbers in pairs, square the first, and reverse the digits.
1 1 (1 x 1 = 1, reversed is 1)
2 4 (2 x 2 = 4, reversed is 4)
3 9 (3 x 3 = 9, reversed is 9)
4 61 (4 x 4 = 16, reversed is 61)
5 52 (5 x 5 = 25, reversed is 52)
6 63 (6 x 6 = 36, reversed is 63)
7 94 (7 x 7 = 49, reversed is 94)
so we require:
8 46 (8 x 8 = 64, reversed is 46)
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