Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

What is the next number in the series?

15 29 56 108 208 ?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

In the image given, you can find several triangles. Can you count them all?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

A solo dice game is played. In this game, upon each turn, a normal pair of dice is rolled and the score is calculated not by adding the numbers but multiplying them.

In a particular game, the score for the second roll is five more than what was achieved in the first roll. The score for the third roll is six less than what was completed in the second roll. The score for the fourth roll is eleven more than what was achieved in the third. The score for the fifth roll is eight less than what was completed in the fourth.

Can you calculate the score for each of the five throws?

Can you count the number of children in the picture below