Complete the table series riddle by finding the number that can replace "??".

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

A newspaper is supposed to have 60 pages, but pages 24 and 41 are missing.
Which other pages won't be there?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

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.

Can you make a six-letter word using the letters N, A and B ?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?