How do you go from 98 to 720 using just one letter?

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

A father's child, a mother's child, yet no one's son.

Who am I?

I don't get anymore wetter, no matter how much rain falls on me.

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

Find out the number of circles in the given picture having Illusion

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

You can hear me, but you can't touch or see me.

What am I?