What do you answer even though it never asks you questions?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

You need to arrange three 7 and mathematical symbols to form number 1?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

1 dollar = 100 cent
= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
= 1 cent

=> 1 dollar = 1 cent

solve this tricky problem?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

What is the largest number you can write with just 3 digits?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?