Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

A man wants to cross the pit of fire which is 25 feet in length and he has 2 planks(fire resistant) 19 feet in length. How can he cross the pit of fire alive?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

A guard is positioned at the one side of the bridge saying ‘A’. His task is to shoot all those who try to leave from ‘A’ to the other side and say ‘B’. He also need to welcome the person who comes from another side ‘B’ to his side ‘A’. The guard comes out of his post every 1 hour and looks down the bridge for any people trying to leave. You are at side ‘A’ and wish to go to another side ‘B’. you also know that it would take 1:45 hr to cross the bridge. How will you cross the bridge?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

What does below rebus means ?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

I’m tall when I’m young, and I’m short when I’m old. What am I?

How many words can a pen with half refill write?

What is the next number in the series?

15 29 56 108 208 ?