What can you see in the middle of March and April that you can never see in any other month?

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

Replace the 'X' with any mathematical symbol to make the expression equal to 111.

18 X 12 X 2 X 3 = 111

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

John gave half of the apples he had plus one more to Jacob. He gave half of the remaining ones plus one more to James. Now, John was left with just one apple.

Can you find out how many did he have in the beginning?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

What is black when you buy it, red when you use it, and gray when you throw it away?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?