Can you decipher the below rebus?

PBLUESAISNUERSES

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

Can you count the number of triangles inside a triangle?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

Find the missing number in the sequence below:

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

A and B have a certain number of chocolates with them. If B gives one chocolate to A, they will have an equal number of chocolates. But if A gives one chocolate to B, then A will be left with half the number of chocolates that B has.

Can you find out the number of chocolates they have right now?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?