Brain Teasers and Puzzles 

Workings

Hint
There are 1,760 yards in a mile, 3 feet in a yard, and 12 inches in a foot.

Answer
Inches in a mile.

Reasoning
There are 1,760 yards in a mile, 3 feet in a yard, and 12 inches in a foot.

So:

1 mile = 1760 yards = 1760 x 3 feet = 1760 x 3 x 12 inches = 63,360 inches in a mile.

And:

There are approximately 1,000 x 52 = 52,000 Sundays in a thousand years. Depending on the day of the week the first day of the year falls, there are actually either 52,177 or 52,178 Sundays in a thousand years.

Workings

Hint
Look for anagrams.

Answer
ceffio.

This is an anagram of office.

The others are animals:
   dgo     = dog
   act     = cat
   ehors   = horse
   ceffio  = office
   elrttu  = turtle
   ekmnoy  = monkey

Workings

Hint
I bought at least 5 of every stamp.

Answer
Five lots of 2p, 7p and 15p, and six lots of 10p, and 20p.

Reasoning
The shopkeeper rightly figured that I required five lots of all of the stamps, which came to (2p + 7p + 10p + 15p + 20p) x 5 = £2.70.

For two of the stamps I needed one more of each, and these must have added to the remaining 30p, so can only have been the 10p and 20p stamps.

Workings

Hint
Look at the vowels (AEIOU).

Answer
20,000.

Each vowel (AEIOU) is worth 4,000 miles and each consonant is worth 2,000.