By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

John, a 5-year-old boy, was really fond of the chocolates. He asked his Mother to give him some money to buy his favourite chocolates. His Mother gave him $45. He went to the shopkeeper and asked, "How much is one chocolate for?". The shopkeeper said $3 for one chocolate. Also, if you give me the wrappers of three chocolates, I will give you one for the exchange.
In total, how much chocolate could John eat?

Can you replace the question mark with the correct number?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Be active and find the killer in the picture Riddle below.

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

A man wants to cross the pit of fire which is 25 feet in length and he has 2 planks(fire resistant) 19 feet in length. How can he cross the pit of fire alive?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

Which digit occurred maximum times between the number 1 and 1000?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?