What English word has three consecutive double letters?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

A swan sits at the center of a perfectly circular lake. At an edge of the lake stands a ravenous monster waiting to devour the swan. The monster can not enter the water, but it will run around the circumference of the lake to try to catch the swan as soon as it reaches the shore. The monster moves at 4 times the speed of the swan, and it will always move in the direction along the shore that brings it closer to the swan the quickest. Both the swan and the the monster can change directions in an instant.
The swan knows that if it can reach the lake's shore without the monster right on top of it, it can instantly escape into the surrounding forest.

How can the swan successfully escape?

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

Can you tell us the current time?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

What is both possible and impossible at the same time?

What runs around the whole yard without moving?

Can you count the number of triangles in the picture below?