Random Puzzles 

Workings

Hint
The number is less than 20.

Answer
8.

Reasoning
We need a number (N) such that:

2 x N = 14 + N
             —
             4

Multiply throughout by 4 to give:

8 x N = 56 + N

So:

7 x N = 56

So N = 8.

Double-Checking
Its double is 16.

Its quarter is 2.

So its double is fourteen more than its quarter.

Workings

Hint
How many gallons did the journey use?

Answer
8 gallons an hour.

Reasoning
I travelled 50 miles in one hour, at 25 miles per gallon this must have used 2 gallons.

So I must have lost the other 8 gallons through the hole.

Workings

Hint
Light travels around 186,000 miles each second.

Answer
Miles that light can travel in 3 minutes.

There are 31,536,000 seconds in a typical year, and light can travel about 33,530,831 miles in 3 minutes.

Workings

Hint
My first letter is M, and watch out for the 4^th letter.

Answer
A monkey.

Reasoning
The 1^st letter can be: M O
The 2^nd letter can be: C O N
The 3^rd letter can be: D B I N
The 4^th letter can be: K O A
The 5^th letter can be: T G E R
The 6^th letter can be: P N Y