Can you fill the blank with the correct number?

6 30 870 756030 _____

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

Rebus Puzzle Definition: A rebus is an illusion device that uses pictures to represent words or parts of words.
What does This Rebus Puzzle Identify?

If an electric train is travelling south, then which way is the smoke going?

What time is it when an elephant sits on a fence?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?

What is full of holes but still holds water?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?