10+10 and 11+11 can give you the same answer.

Explain how?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

With the help clues provided in the image, can you find the 5 digit key?

What goes through cities and fields, but never moves?

I am an odd number. Take away a letter and I become even. What number am I?