It has five wheels, though often think four, You cannot use it without that one more, You can put things in it, you can strap things on top, You can't find it in the market, but you can still go shop. What is it?

People make me, save me, change me, raise me. What am I?

O_er_t_o_

Complete the missing letters of the given word.

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

You need to remove two matchsticks to make the below equation true. Can you do it ?

What is next number in the pattern below:

131 517 192 123 ?

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?