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

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

Can you place six X (crosses) in below board without making three in a row in any way ?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

A new clothing store has a unique method of pricing items. A vest costs $20, a tie costs $15, a blouse costs $30, and underwear costs $45. How much would pants cost?

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?