Using Only Five 5's and any mathematical operator make sum as 37

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

What do you call a fish without an eye?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

Solve the equation in the image by looking at the pattern closely.

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?