When I am clean I am black , When I am white and dirty ? Who I am

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When I am clean I am black , When I am white and dirty ? Who I am

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The more look you at it, the less you see.
What is it?

What 5-letter word typed in all capital letters can be read the same upside down?

Where do horses go when they get sick?

I come knocking but once, embrace me when i appear, for i may not come again.
What am I?

You just smashed open your piggy bank and counted 55 coins totaling $10.00.
There are more nickels than pennies, more dimes than nickels, and more quarters than dimes.
How many of each coin is there?

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I'm under your face,
I'm outside your mind;
a biological case,
pressure brings pain sometimes.
What am I?

When does 15 ever go equally into 24?

If:
8809 = 6
7111 = 0
2172 = 0
6666 = 4
1111 = 0
3213 = 0
7662 = 2
9312 = 1
0000 = 4
2222 = 0
3333 = 0
5555 = 0
8193 = 3
8096 = 5
7777 = 0
9999 = 4
7756 = 1
6855 = 3
9881 = 5
5531 = 0

Then, 2581 = ?

Three friends check into a motel for the night and the clerk tells them the bill is $30, payable in advance. So, they each pay the clerk $10 and go to their room. A few minutes later, the clerk realizes he has made an error and overcharged the trio by $5. He asks the bellhop to return $5 to the 3 friends who had just checked in. The bellhop sees this as an opportunity to make $2 as he reasons that the three friends would have a tough time dividing $5 evenly among them; so he decides to tell them that the clerk made a mistake of only $3, giving a dollar back to each of the friends. He pockets the leftover $2 and goes home for the day! Now, each of the three friends gets a dollar back, thus they each paid $9 for the room which is a total of $27 for the night. We know the bellhop pocketed $2 and adding that to the $27, you get $29, not $30 which was originally spent.
Where did the other dollar go?

The person who made me does not want me , the person who bought me does not need me, the person who
needs me does not know it, what am I?