Find the next number in the series below

21 32 54 87 131 ?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Can you replace the question mark with the correct number in the below table sequence?

A bomb exploded in a room full of married couples and no one died. How?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?