what does the below math rebus puzzle mean?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Joseph buys three kinds of chocolates for 100 rupees. The first one is priced at 5 rupees, second one at 3 rupees and third one at 0.5 rupees.

If he bought 100 chocolates in total, how many pieces do you think he bought each chocolate?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

Can you find any error in the following sentence?

A taxi was standing outside a fort at night. A man came out of the fort, opened the gate and hit the taxi driver killing him instantly. He took all the money out of the meter and started running till he was caught by a local sheriff.

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

How can a man go eight days without sleep?