What does the below rebus riddle means?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

What has a bottom at the top?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Solve the mathematical equation in the picture below.

You can hear me, but you can't touch or see me.

What am I?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

I have teeth but i don't bite. Who Am I ?