15 out of 16, although some close calls.
I know the cadences of the Bible, but I don't know heavy metal at all.

(quite chuffed actually, even while admitting to guesswork!)

Well...Bible verses rarely rhyme, or have an easily recognizable rhythm.:D

OK, if it's not 6, what is it?

If you count the letters in each, it goes 3-5-4 on the top, and 3-4-? on the bottom, which could leave either seven or eight as the missing five-letter number.

It's a bullshit rationalization, but it's one way of looking at it from outside the box, anyway.

5.

1/2, 3/4, 5/5. One-half, three-fourths, a whole.

NFC.:headshake

1+3+5 add up to 9, so this is a problem that asks "what three numbers add up to nine?"
2 +4 will only add up to 9 if you add 3, so the answer is 3.

Nope.

None of us? That makes me feel a little better.

Nope, none.

Is it 3; because, 135 and 243 are divisible by 3 and powers of 3?

Is it 3; because, added all together the total is 18 which is the age of majority?

Is it 3; because, following the words "Think about it" there are two sets of three dots but it can't be six?

If it's not 3, then it must be 7; because, the beanbag landed on 6.

Attachment 52466

This is looking more and more like a trick question. :eyebrow:

Trick question? No. But you own your assumptions.
I tried for a least five minutes to figure out the pattern, then gave up and scrolled to...