Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

Can you find the key in the picture below?

Can you place three balls such that the equation shown in the picture holds true?

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

What has 13 hearts but no other organs?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?