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

Can anyone tell me a word in the English dictionary which has a silent 'z'?

Decode this picture on T-Shirt and tell what it says ?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

A man is found unconscious in front of a store at two in the morning. His head is bleeding and there’s a brick laying next to him. When the police arrive, they carry the man to jail. Why did they arrest him?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100