To think that this sum is super simple

[PeerieBreeks]

and can't understand how so many people on Facebook have it so completely wrong (and can justify it to themselves).

Without adding your reasoning, tell me what you think the answer is.

20

Slight thread derail, but I think I’ve just properly got the monty Hall thing.

Because you choose your door first the probability of you having the car is 1/3. And Monty knows what’s behind the doors and must leave the car behind the closed door if it’s one of the two remaining doors So:
1/3 of the time your original door will have the car and Monty can open either of the other doors because they both have goats.
2/3 of the time your door will have a goat which means the remaining door must have a car behind it.

Under those conditions it can’t be 50/50.

As far as I can tell he’s £50 out of pocket and no horse!!

20! Two separate transactions both of which net him 10 - each time he sells for ten more than he buys.

$20 profit

$20

I'm useless at maths but even I got it right. I can't understand the confusion here.

Two columns, IN & OUT

IN: 70 + 90 = 160

OUT: 60 + 80 = 140

160

• 140

----- = 20

he's up 10 nett

Can you show your workings grwm1?

You know when you hear about some kind of financial miss-selling scandal? And you think... How? How were people so stupid to go for that?

Or when people say they didn't understand that only paying the minimum payments on £10k credit card would mean their actual debt was increasing?

Or when people don't understand how to compare supermarket offers?

This thread is evidence that shit loads of people have a shaky grasp of logic and do not posses basic maths skills. Or common sense.

I think I've been hearing ghostly whinnies emanating from this thread for quite some time ...

I hope none of you are in business 😆

Those who can’t work out that is.

20 up by !y reckoning

$20 up - I think maybe people forget he had an outlay at the beginning?

Or maybe I fucked it up

1. Anybody who doesn't get $20, what about this:- Man buys horse for $80 and sells for $90. He then buys horse back for $60 and sells for $70. In the end how much has he made or lost, or has he broke even?
2. Everybody else who gets $20, what about this:- Jack buys horse for his business from Tom for $60 . Jack's business then sells it to Jack personally for $70. Jack sells it back to his business for $80, and it is then sold to Harry for $90. In the end how much has he made or lost, or has he broke even?

@TeaMakesMeHappy
Was the BIDMAS problem you mentioned 6÷2(1+2)=?
and were you in the "1" camp or the "9" camp?
The answer is 1 - The first "two" is the numerator of the expression in brackets just as the two in 6÷2a=? is the numerator of "a" and if a=3 then the answer is 1.

@jcyclops no it wasn’t that one, it was a couple of years ago I think. But yes, that one would definitely be 1.

Assuming, in scenario 2, that Jack first bought the horse using his business account, not on his private account? In which case there is only one transaction.

Jack buys for $70 and sells for $80 so personally makes ten.

Wow. I take it all of the PP who are brilliant at maths and can't believe anyone would get anything wrong are 100% perfect at everything. I'd hate to live in such judgemental minds.

Makeitso it's not a case of being brilliant at maths. It's maths my 7 year old can do. She is clever but not exceptionally so.

Anyone struggling with the Monty door question, it might help to understand if you imagine there are one hundred doors.
You pick one at random. Odds of it being correct are 1/100. Monty then gives you a chance to swap with another door. The door you chose was random. One in a hundred. The door he chose is not random, as he knows where the car is. Your door is still one in a hundred, therefore as one of the doors must have the car, the door he picks must be odds of 99/100. So you always swap.
Does that make it easier?

My 10 year old can speak Spanish (we're not native speakers and don't live there btw) I don't make fun of adults who can't.