Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

There is a straight highway. Four different villages lie on that highway. The distance between them is different. The third village is 60km away from the first village; the fourth is 40 km away from the second; the third is 10 km near to the fourth that it is to the second.

Can you calculate the distance between the fourth and the first village ?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

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

Spot 5 differences in two Christmas tree below:

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

A girl rode into a tourist spot out of the city on Thursday. She loved the place and decided to stay for a few days. She stayed for four days and then she left for back home on Thursday.

How can this be possible?