While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

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

Explain how?

When can we add 2 to 11 and get 1 as the correct answer?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

A man fell off a smuggling boat into deep water. He could not swim and he was not wearing anything to keep him afloat. It took 30 minutes for the people on the boat to realize someone was missing. The missing man was rescued two hours later on the return trip. Why didn't he drown? Note:- He didn't know swimming, the sea was deep, and He wasn't holding anything

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Find the 8 in the below-given Image.

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?