What always comes into a house through the keyhole?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Can you count the number of matches in the picture below ?

Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

You are on your way to visit your Friend, who lives at the end of the hill. It is his birthday, and you want to give him the cakes you have made. Between your house and his house, you have to cross 5 bridges, and as it goes in the land of make believe, there is a troll under every bridge! Each troll, quite rightly, insists that you pay a troll toll. Before you can cross their bridge, you have to give them half of the cakes you are carrying, but as they are kind trolls, they each give you back a single cake. How many cakes do you have to leave home to make sure that you arrive at a friend's house with exactly two

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

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?

I add 5 to 9 and get 2. The answer is correct, so what am I?

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