Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?

Which alphabet letter is a question?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

If eleven plus two equals one, what does nine plus five equal?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Find the value of "?" in the ball picture Riddle below:

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?

Be active and find the killer in the picture Riddle below.