Decode below rebus
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With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

I am white when I am dirty, and black when I am clean. What am I?

I left my campsite and hiked south for 3 miles. Then I turned east and hiked for 3 miles. I then turned north and hiked for 3 miles, at which time I came upon a bear inside my tent eating my food! What colour was the bear?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Wednesday, Steve and Pam go to a restaurant to eat lunch. After eating lunch, they pay the bill. But Steve and Pam do not pay the bill. So…who does?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?