Puzzle 729
If you write all of the numbers from 1 to 100 as words: ONE, TWO, THREE, …, ONE HUNDRED:
Which number is first alphabetically?
Which number is last alphabetically?
Which is the most common letter?
Which is the least common letter, and which number does it appear in?
Which letter is never used?
What is the total number of letters?
Which number is the longest?
How many numbers start with the letter T?
How many numbers contain the letter V?
100 is the first number to contain the letter N, what is the last number before 100 to contain a new letter for the first time?
If we carry on writing, when does the letter A first appear?
If we carry on writing, when does the letter B first appear?
Some questions have more than one answer, can you find them all?
Puzzle 730
Kevin is 5 years old, James is also 5, Rebecca is 7, and Albert is 6.
How old is Jacqueline?
Puzzle 731
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 732
What comes next in this sequence:
iron · bromine · uranium · argon · ?