Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

How many times can you subtract the number 5 from 25?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

who is silent in the parliament?

Decode below rebus
D
N
A
T
S , D

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

Can you solve below mathematical equation?

2^1234 - 2^1233

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

What am I?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Rearrange the letters in "new door" to make one word.