Mindworks 3 : Einstein’s riddle

This riddle was said to have been developed by a very young Einstein. It has also been said that Einstein said that 98% of the world would not be able to solve it. I no clear proofs of this, but it is a really good work for the mind. So I present it here. It needs...

Mindworks: 2

This is something I unearthed on the Internet. Solve this riddle. 3 = 18 4 = 32 5 = 50 6 = 72 7 = 98 10 = ?   Have fun!   Answer can be found here.

Mindworks: 1 workings

The workings. There are 18 animals in a pet store. Some are birds and some are dogs. There are 50 legs in all. How many birds and how many dogs are there? Say we set dog as x and bird as y. From the question we get: x + y = 18          (Eq. 1) 4x + 2y = 50    (Eq. 2)...