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

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

How many triangles can you count in the figure given?

Why Aeroplane windows are round?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Identify the hidden meaning behind this picture?

What breaks yet never falls, and what falls yet never breaks?