Can you fill the blank with the correct number?

6 30 870 756030 _____

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

In the Thar desert, 3 men found a big 24L Jar is full of water. Since there is a shortage of water so they decided to distribute the water among themselves such that they all have equal amounts of it. But they only have a 13L, a 5L and an 11-litre Jar.

How do they do it?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

Doctor Alex and a bus driver John are both in love with the same woman named Olivia. The bus driver need to go for a long trip of 10 days, Before he left he gave Olivia 10 apples.

What does this Rebus Picture means ?

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

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

Which country gets ill every time?

Can you count the number of squares in the figure below?