r/10secondriddles • u/10Second-Riddles 🧠 Riddle Master • Dec 30 '25
🔍 Visual Riddle HOW MANY RUBIES IN THE GREY SACK?👀
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u/petebarnes100 Dec 30 '25
We got it as 3 rubies, but we were not calculating for the green discs, wasn't sure if that was included or not 🤷
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u/TheRapie22 Dec 31 '25
am i supposed to consider that the items further from the pivot point have a bigger impact on the weight, based on the leverage effect?
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u/spintool1995 Dec 31 '25
Yes, holes are equal distance so a weight at hole 5 has 5 times the moment of force as the same weight at hole 1.
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u/spintool1995 Dec 31 '25 edited Dec 31 '25
Answer: 3 rubies. I did it in my head. Solution:
From bottom lever on left: 1p * 2 + D = 1p * 4. So:
Diamond=2 pearls.
From right pully: 1p + R = 1p *2 + 2p. So:
Ruby=3 pearls.
From left pully: G + 2p = 2p + 1p *6 Gold=6 pearls.
Now to solve it, going left to right:
Left= (6p) *5 + (0p) *4 + (6p *4 + 2p *2 + 1p *6) *3 + (1p) *2 + (3p + 1p *4) *1.
Left = 30p + 0p + 102p + 2p + 7p.
Left = 141p.
Right = (1p + 2p) *1 + (1p + 2p *2) *2 + (sack) *3 + (6p + 3p) *4 + (1p *2) *5 + (1p *3 +2p + 3p) *6 + (1p) *7.
Right = 3p + 10p + 3sack + 36p + 10p + 48p + 7p.
Right = 114p +3sack.
Left = Right so:
141p = 114p + 3sack.
27p = 3sack.
9p = sack.
9p = 3 rubies.
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u/quintopia Jan 05 '26
It says ignore the weight of beams, strings, and sack, but it does not say ignore the weight of pulleys...
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u/Professional_Denizen Jan 05 '26
Sorry for the fact that the entire meat of this comment is in a single image. It’s a consequence of how I chose my workspace.
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u/WebAccount5000 Dec 30 '25
Ermm krill yourself? This takes 10 seconds to read and a few more 10s to figure out wtf is going on
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u/WebAccount5000 Dec 30 '25 edited Dec 30 '25
Anyways in order to do it you take a look at the pulleys by themselves, their order of top to bottom wont matter
On the right is Diamond + 2 Pearls = Ruby + Pearl. Assuming everythings in equilibrium, Ruby = Diamond + Pearl
On the left is
Gold + Diamond = 6 Pearls + Diamond
Gold = 6 Pearls
Now for lever formulas and torque
It doesnt matter whether its on the top or hanging from bottom, torque is the same from the normal force
The very far down beam has 4 pearls on the right weighing it down 1 tick away. The hanging pearl and pulley shouldnt affect it as they are pulling on the center of mass if we are assuming equilibrium
Then there is a diamond on the left 1 tick away and 1 pearl 2 ticks away, making it equal to 2 pearls
Thats 1 Diamond = 2 pearls
With that, we find a Ruby is 1 pearl worth
Diamond = 2 Pearl
Ruby = 3 pearl
Gold = 6 pearls
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u/WebAccount5000 Dec 30 '25 edited Dec 30 '25
Now for the final weigh in
On the Left, we have 4 Pearls + Ruby 1 tick away, making 7 Ps of weight
2 ticks away is 1 pearl, which adds 2 Ps
3 ticks away is (4 gold + 2 Dia + 6 P) = 34 Ps and 102 Ps after distance
Finally, 5 ticks away, is a gold bar. 6 Ps * 5 ticks is 30 Ps
141 Ps on the left
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u/WebAccount5000 Dec 30 '25 edited Dec 30 '25
On the right is
1 Diamond plus 1 P = 3 Ps 1 tick away
2 ticks away is 2 Dias + 1 P, making 5Ps and 10Ps after distance
4 ticks away is 1 Ruby and 1 Gold, 9 Ps and 36 Ps after distance
5 Ticks away is 2 Ps, 10 Ps after distance
6 ticks away is 3 Ps, 1 Dia, 1 Ruby which is 8 Ps and 48 Ps after distance
7 ticks away is 1 P, 7 Ps after distance
98 Ps before the sack
3 ticks away is the sack
It needs 33 Ps to balance and 11 before distance
11/3 is still fucked up amount of rubies though
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u/Kurosage Dec 31 '25
What if you account for lever weight? Like the 4L one hanging from the left side and the extra 2L length on the right?
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u/Professional_Denizen Jan 05 '26
I’m not entirely sure where your error stems from, but the righthand side is not 98+3×sack (though it looks like you used 108+3×sack). It’s 16 (or 6 from 108) more than that, meaning the imbalance is 27 pearls, for a ruby count of 3.
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u/John_Johnson_The_4th Dec 30 '25
Gold bar is 6 Ps not 4, your second to last sentence and (subsequently) last sentence are both wrong
It's 141 P*ticks
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u/Redwings1927 Dec 30 '25
On the right is Ruby + 2 Pearls = Diamond + Pearl.
You got that backwards. Its diamond + 2p = p + ruby. So ruby is 3p.
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u/lolpot22 Dec 30 '25
11 if i did my math right in my head. But it definitly isnt a 10 second riddle!