What is so fragile that saying its name breaks it?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

How do you go from 98 to 720 using just one letter?

Which city is three-fifths chick two third cat and 50% goat?

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

Why do people go to bed?

The Federal bank of London is abducted by the robbers. The head of the robbers asked the cashier to empty their money vault to them and when suddenly cashier got a call from her father. To avoid any suspicion, the robber asked the cashier to pick the call and reply her father in the shortest manner possible.

The cashier told her father "Is there an emergency father, Call me when you are free and I will help you in your furnishing" and then the cashier hung up the phone.

After 10 minutes, police arrived at the crime scene.

How did the police know about the robbery?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

I am quite hot but become too cold if you remove the first two letters. What am I?

Replace the question mark with the correct number.