Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Which wheel of car does not rotate when you turn your car right?

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

A pack of cards has 40 cards. You are blindfolded. Out of 40, 25 cards are facing down while 15 are facing up. You have been asked to divide this pack of cards into two decks - so that each deck contains an equal number of face-up cards. Remember, you are blindfolded.

How will you do it?

What happened when the wheel was invented?

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?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

John was driving a bus and got stuck when passing through an underpass. Then came Jacob with a needle and got the bus out of the underpass.

What did the boy do?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145