What does this rebus means ?

PROG WORKRESS

Can you count the number of squares in the figure below?

What demands an answer, but asks no questions

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Find the next number in the series

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

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

Rahul decided to meet Simran so he boards a local train from Bombay station. Just after the station, there is a 1km long tunnel. The train starts and is now accelerating. Rahul is a claustrophobic guy, so what is the best position for him to sit?