What number comes next in the series?

5 15 5 18 5 24 14 20 _

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.

Who can jump higher than a Mountain?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

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

How many letters are in the alphabet?

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?

what's the probability of getting a king or a queen from a pack of 52 cards?

Replace the question mark with the number below given a simple math problem.