In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

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

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?

Why do people go to bed?

What has a ring but no finger?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

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

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Complete the table series riddle by finding the number that can replace "??".

Next Number in the Series,

5, 16, 49, 104, ?