Brain Teasers and Puzzles 

After visiting one of my very old relatives, I travelled home in their old jalopy. The car was old and battered, it had a leak from the petrol tank, and I was stuck in second gear.

This meant that I could only travel along at a steady 30 miles per hour and managed a paltry 20 miles per gallon of fuel.

At the start of the journey, I had placed exactly 10 gallons of fuel into the tank. I knew though, that the fuel tank lost fuel at the rate of half a gallon per hour.

Just as I arrived home, the car stopped because it had run out of fuel and I had only just made it.

How far was it from my relative's house to my home?

Puzzle Copyright © Kevin Stone

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A rope swing hangs vertically down so that the end is 12 inches from the ground, and 48 inches from the tree.

If the swing is pulled across so that it touches the tree, it is 20 inches from the ground.

How long is the rope?

Puzzle Copyright © Elliott Line
This puzzle appeared in Mensa's EnigmaSig (198.24) and is used with permission.

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• Place letters into the grid such that every row, column, and 2x2 block has letters (in any order) that form a common word.
• Each letter is only used once, and no letter is repeated in the rows/cols/blocks.
• Letters allowed: C O L U M B U S.

D			K
	P
		E	T
E	L		A

Puzzle Copyright © Alan Stillson and Frank Longo

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Starting with the 6 in the bottom left corner, what is the highest total you can make, if you only move up or right, using the mathematical signs on the way?

+	4	-	1	+	3
2	+	4	-	1	+
-	3	+	2	-	2
2	-	4	+	3	-
+	3	-	1	+	2
6	+	1	-	2	+

Puzzle Copyright © Kevin Stone

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