What is wrong in the below Picture?

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

Explain how?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

Can you find any error in the following sentence?

A taxi was standing outside a fort at night. A man came out of the fort, opened the gate and hit the taxi driver killing him instantly. He took all the money out of the meter and started running till he was caught by a local sheriff.

Here is a Swiss Cross. You have to make two straight cuts in the figure so that it is divided into four congruent pieces. Also, you should be able to join these pieces into a square then. Can you accept this challenge?

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?

Can you solve the maths in the below-given picture equation?

Find the next number in the series below.

6 18 270 72090 ?

What number do you get when you multiply all of the numbers on a telephone's number pad?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?