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

Can you find the key in the picture below?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

What is the next number in the series?

15 29 56 108 208 ?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

John is pretty weird. He likes toffees but hates chocolates. He loves books but never reads. He likes to build his troops in an online game but does not proceed with the war. He likes to go swimming but is afraid of water.

Seeking this behaviour, can you tell whether he likes balloons and parties?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

A man is found dead in his bathroom naked with blood scattered all around him. The bathroom was locked from the inside and there is no trace of any struggle. There is nothing in the bathroom except his pant with the belt still around and his shirt. Also, the medic team can't find any incision in his body that may have been the reason behind so much blood loss.

The Police department is clueless regarding this murder mystery.
Can you?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?