The Greek ship leaves at six and carries coffee.

The ship in the middle has a black chimney.

The English ship leaves at nine.

The French ship with a blue chimney is to the left of a ship that carries coffee.

To the right of the ship carrying cocoa is a ship going to Marseille.

The Brazilian ship is heading for Manila.

Next to the ship carrying rice is a ship with a green chimney.

A ship going to Genoa leaves at five.

The Spanish ship leaves at seven and is to the right of the ship going to Marseille.

The ship with a red chimney goes to Hamburg.

Next to the ship leaving at seven is a ship with a white chimney.

The ship on the border carries corn.

The ship with a black chimney leaves at eight.

The ship carrying corn is anchored next to the ship carrying rice.

The ship to Hamburg leaves at six.

Which ship goes to Port Said? Which ship carries tea?

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ANSWER: Every page number has a digit in the units column. With N pages, that’s N digits right there. All but the first 9 pages have a digit in the tens column. That’s N – 9 more digits.All but the first 99 pages have a digit in the hundreds column (accounting for N – 99 more digits).

I could go on, but not many books have more than 999 pages. A book with 1,095 digits in its page numbers won’t, anyway.This means that 1,095 must equal:

N + (N – 9) + (N – 99)This can be simplified to:

1,095 = 3N – 108.That means that 3N = 1,203, or N = 401. That’s the answer, 401 pages.