this post was submitted on 11 Apr 2025
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I have seen this or a variation of this too many times now, saving this for my own meme responses, its too fucking useful.
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Some bureaucrats in Mexico City tried this years ago.
An important ring road had two lanes in each direction. To increase its capacity, they didn't actually widen the road; they just repainted the lane markings to turn two lanes into three, and claimed a 50% capacity increase!
Everyone immediately screamed about being crammed together just centimetres apart, accidents increased and the city officials quickly u-turned; they repainted to have just 2 lanes in each direction again.
But they then tried to claim that as that was a 33% decrease, and that because they had earlier increased it 50%, that meant they had achieved a net 17% increase in the road's capacity!
Brought to you by the same people that can’t explain tides
Tide comes in, tide goes out. You can't explain it!
Bread goes in. Toast comes out. It’s a mystery!
Magnets, how do they work?
Nobody knows! Like how you can only see the effects of the wind, but can’t see or explain it.
That knowledge is probably locked away in the 90% of our brain we don’t use.
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Ah yes I hate those
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TBF Yang really did write the equation in the sloppiest way possible.
Like I know what he MEANS but no math professor in the world would let this shit slide.
Yeah if you put it:
100 - (100 x 0,1) = 90
90 + (90 x 0,1) = 99
It comes quite obvious. And I know the brackets are redundant, but my coder mind forces brackets to all math formulas for readability.
Was it on purpose, maybe.
I think of it as
100 x 0.9 = 90
90 x 1.1 = 99
Am I the odd one out?
Yes.
But also, Barqs does have bite.
Percentages for show, decimals for a pro
Shameless plug for Engineering Memes community ported during the great API migration: !engineeringmemes@lemmy.world
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Even
100 - 10% = 90
90 + 10% = 99
Works better than what he did, because that’s how you’d enter it on a standard calculator.
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Readability is important. I do the same thing, because just because something is technically correct doesn't mean there isn't a better way to do it. I'm very pro-bracket.
Decimal commas ain't 'merican: you'd totally throw them with your weird euro math.
It's twitter, why'd anyone put effort in what they write.
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pegglegg back in fifth grade: 'why i need to learn this math stuff. i aint never gunna use it'
It's not that you will regularly have a calculator in your pocket
Checkmate
you still need to know what buttons to push on the magic box, and in what order...
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I might as well throw the same comment in here. You learn this pretty quickly when you bet on meme stocks. Down 90% then up 100% I can assure you, you are no where near where you started.
Same with crypto. You'll get a notification something went down 10%, then up again 10%, but if you zoom out you see it's just been slowly going down on average since the last huge spike.
Yang botched it by chaining = wrong.
100 − 10 = 90 + 9 = 99
❌ cringe
100 − 10 = 90
90 + 9 = 99
✔️ based
Both sides are right in a way. It just depends on what you're comparing the +/-10% to
This is clearly about the US stock market crashing. In that case it's always the days gain/loss, in which case Yang is the only person who is right.
This is important because a lot of people saw "down 10%" and now "up 10%" without realizing that's still day over day loss.
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Percent increase/decrease is change/original.
That is the difference between percent and percentage points.
Not even close to that anyway, the dow jones for example went from 44k to 37k back up to 40k. Still hasn't even regained half the value it lost.
It's only the same if it's up 10% compared to the original number. It all depends on your time period, you could be up 30% compared to 7 years ago.
Tesla stock prices are good example of this. They are down ~50% since december and up ~70% since lowest point in april last year.
Don't they teach math in the US anymore? Or do you get a pass on basic subjects if you are on the football team?
No they definitely teach math but unfortunately math is kind of useless when they don't teach critical thinking.
Because then people blind themselves with their own bias and refuse to actually critically think about what they're reading and realize that they misread it or misunderstood it.
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You get a pass on pretty much every subject because the school's interested in churning out worker drones rather than thinkers. Do this long enough and you get Trump supporters.
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Practice is important. People definitely learn this level of math, but not using it for years dulls the senses. On top of that, lots of people scrape through school doing the bare minimum. (Not always their fault of course. Not everyone has ample opportunity to excel in school due to a variety of things.) From what I hear, the bar for graduating high school is not incredibly high, so people like this don’t surprise me.
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Yeah he totally cooked Yang. That guy has NO IDEA where the 9 came from.
This is why in forecasting and time series analysis is used the log difference, a 10% increase or decrease on the log scale gives you the same value being added or removed.
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Multiplication is commutative dipshits.
A x B = B x A
So 1.1 x .9 is always going to be .99, regardless of the order. Didn’t we learn this in like middle school?
(Edit … to be clear I’m calling the people in the image dipshits, not the people commenting here).
Huh? We're talking about percentages not multiplication. Where'd the 1.1 and .9 come from?
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