What begins with T, ends with T, and has T in it?

How many times can you subtract the number two from the number fifty?

It has five wheels, though often think four, You cannot use it without that one more, You can put things in it, you can strap things on top, You can't find it in the market, but you can still go shop. What is it?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Spot 5 differences in two Christmas tree below:

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

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

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?