It is always ahead of me yet I can never see it. What is it?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

What is the word or phrase?

John and his team plan to rob a safe. They got just one chance to break the code else the local police will be informed. Below are clues:
A) Exactly one number is perfectly placed: 9 8 1
B) Everything is incorrect: 9 2 4
C) Two numbers are part of the code of the safe but are wrongly placed: 0 9 3
D) One number is part of the code of the safe but is wrongly placed: 1 4 7
E) One number is part of the code of the safe but is wrongly placed: 7 8 3

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

What is more useful when it is broken?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?