By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Our product and our sum always give the same answer. Who are we?

What is the next number in this series?

4,12,84,3612....

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Jack was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?