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

Find the number of squares in the below picture

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

Can you find the six hidden animals in the picture below?

The centre of the third figure is empty. What digit should fit inside?

A man was found murdered on Sunday morning. His wife immediately called the police. The police questioned the wife and staff and got these alibis: The Wife said she was sleeping. The Cook was cooking breakfast. The Gardener was picking vegetables. The Maid was getting the mail. The Butler was cleaning the closet. The police instantly arrested the murderer. Who did it and how did they know?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

What can you hold in your right hand, but never in your left hand?

How can you make number one disappear by adding something to it?