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

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Can you name four days which start with the letter 'T'?

Why is 6 afraid of 7?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

Can you place three balls such that the equation shown in the picture holds true?

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!

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?