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

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

I am the fastest animal but cannot climb the tree. What am I?

If six children and two dogs were under an umbrella, how come none of them got wet?

Solve the puzzle by telling what does below picture means.

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?