What is the next number in this series?

4,12,84,3612....

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

Spot 5 differences in two Christmas tree below:

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

10+10 and 11+11 can give you the same answer.

Explain how?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

Jack and Joseph are well-known golf rivals. One Day during a match, they were level at a score of 30. Jack hit a bad shot and Joseph added 10 to his score. Joseph then hit an awesome shot and he won the game.

How ?

Before Mount Everest was discovered, what was the highest mountain in the world?

In a school, 280 students studied chemistry, 254 students studied physics and 280 students studied biology.

97 students studied chemistry as well as physics, 138 students studied physics as well as biology and 152 students studied chemistry as well as biology.

73 students studied all the three branches.

Can you find out the total number of students?