What number do you get when you multiply all of the numbers on a telephone's number pad?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

Can you solve the rebus below?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

There's a day, that comes around once a year.
To celebrate the man, you hold dear.
He gave you life, love and will pick you up if you fall.
When it comes to guys like him, He's the best of all.
Who is he?

Find the value of "a" by solving the maths equation in the picture below:

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927