Earlier today I set the following puzzles from Swedish magician Fredrik Cattani. Here they are with their solutions.

**Money, Money, Money**

You drop coins into your empty left hand, one at a time. Every time a coin hits another coin you hear a clonk. After four clonks, how many coins do you have in your left hand?

*SOLUTION: Five coins. The first coin doesn’t clonk on anything. Fredrik says that many people respond ‘four coins’ without thinking it through properly. The faster you answer, the more likely you are to make the mistake. *

**An L of a cookie puzzle**

Four cookies are placed in an L-shape, with three in one row and two in the other. Can you move one cookie so there will be three cookies in each row?

*SOLUTION: Put the top cookie on top of the corner cookie. That way you have three in each row. The reason this can be hard to solve is that the reader interprets “in each row” as “along a line in single file.”*

**Fork handles**

There’s a classic puzzle that asks you to make a square with two forks on a table. The solution is to place the two forks perpendicular to each other at corner of the table, and using two sides of the table you create the square. But can you take the same two forks and and make four squares instead? No bending allowed!

SOLUTION:

**Thank you for the pencil**

Put your hands together, with a pencil between your thumbs, as above. Can you twist your hands so you get to the position where the pencil is underneath, as in the second image, resting between your palms and your thumbs? During the twist you cannot let go of the pen.

SOLUTION:

*Here’s how I did it: turn one hand almost 180 degrees around the axis of the pencil, and then twist that hand round to the front by moving it along the top of the other hand. *

I hope you enjoyed today’s puzzles. I’ll be back in two weeks.

*I set a puzzle here every two weeks on a Monday.** **I’m always on the look-out for great puzzles. If you would like to suggest one, email me.*

*Thanks to Fredrik Cattani for today’s puzzles. His website is **www.filiokusfredrik.se.*

*I’m the author of several books of popular maths, including the puzzle books Can You Solve My Problems? and Puzzle Ninja, which is just out in paperback.*

*I also co-write the children’s book series Football School.*