What four weights can be used to balance from 1 to 30 pounds?

What does below Rebus say?

XLR8

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

What is common among 11, 69, and 88?

What is the next number in this series?

4,12,84,3612....

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?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

If an electric train is travelling south, then which way is the smoke going?