It contains 10 riddles with logical mathematical principles that help you to pass the time in a fun way besides stimulating your neurons and it is a good training for numerical skills.
It includes a qualifier of the answer you give, a pencil so you can do operations on the screen and you can erase what you have written.
I hope it's useful.
Any comments please send an email to: [email protected]
If you want more riddles, please comment in the mail.
Best regards to all and thanks.