What is the next number in this matchsticks series riddle?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

There are three boxes on a table. One of the box contains Gold and the other two are empty. A printed message contains in each box. One of the message is true and the other two are lies.

The first box says "The Gold is not here".

The Second box says "The Gold is not here".

The Third box says "The Gold is in the Second box".

Which box has the Gold?

Can you find the company name in the pictogram below?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Why do you find that most of the buildings are deprived of the 13th floor?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?