What does this mathematical rebus means ?

Count the number of triangles in the given picture.

Which five letter word can be added at the end of below word to form a
valid word?

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Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

Doctor Alex and a bus driver John are both in love with the same woman named Olivia. The bus driver need to go for a long trip of 10 days, Before he left he gave Olivia 10 apples.

There is something which you can be arrested for attempting but not for successfully completing.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

This was asked in an interview with Coa-Cola.

The interviewer has given me 100 marbles(50 white and 50 black) and two empty boxes.
He then told me that he will leave the room and i need to place all the marbles in two boxes.

And When he come back, he will draw a marble from any of the two box and if the marble is white I will be hired.

Also
* No box can be empty.
* All 100 marbles must be placed in one of the two boxes.

So what should I have done?

What building has the most stories?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?