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Started by Fezziwig on May 29, 2016 4:52:17 PM
Maths problems.

1 + 4 = 5

2 + 5 = 12

3 + 6 = 21

8 + 11 = ?

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limegreen - 29 May 2016 16:55:23 (#1 of 77)

96?

Fezziwig - 29 May 2016 16:56:21 (#2 of 77)

Many folks are saying that but I don't agree.

hailesaladdie - 29 May 2016 16:56:23 (#3 of 77)

19. Otherwise it's a logic problem.

Fezziwig - 29 May 2016 16:58:03 (#4 of 77)

It is said that 1 in 1000 get it right.

hailesaladdie - 29 May 2016 16:58:10 (#5 of 77)

But yes, it's 96. The formula is a + a × b.

And don't get me started on those fucking bodmas problems that litter my LinkedIn feed.

TommyDGNR8 - 29 May 2016 16:58:40 (#6 of 77)

Whatever answer you want it to reach, it isn't reached through the standard rules of arithmetic and therefore the use of standard notation is not only misleading, but wrong.

Fezziwig - 29 May 2016 16:58:52 (#7 of 77)

But there is no x (times) there??

hailesaladdie - 29 May 2016 16:59:52 (#8 of 77)

That's why it's a load of shite

Tadagee - 29 May 2016 17:00:39 (#9 of 77)

96 shirley

Fezziwig - 29 May 2016 17:01:19 (#10 of 77)

My answer is that they are not using base 10 and 8 + 11 has the quirk of adding up to 19 for bases, 10.11, 12, 20.. even 32.

Answer is 19.

TommyDGNR8 - 29 May 2016 17:34:43 (#11 of 77)

If you rewrite it as a string of numbers then the first number after each "=" is the sum of the numbers between the previous ones; answer becomes 40.

1 + 4 = 5 2 + 5 = 12 3 + 6 = 21 8 + 11 = ?

Gotout - 29 May 2016 17:37:27 (#12 of 77)

They could be converting the base 10 answer into a series of reducing bases. The first answer is base 6, the second base 5, the third base 4 and the 8+11+19 becomes 201 in base 3.

Post by deleted user
TommyDGNR8 - 29 May 2016 17:42:42 (#14 of 77)

Good spot, Gotout.

Fezziwig - 29 May 2016 17:50:55 (#15 of 77)

Can't be base 3. 8 and 9 don't exist in 3. It is any base 10 and above.

Even base 999

8 + 11 (1000) = 19 (1008)

TommyDGNR8 - 29 May 2016 17:55:39 (#16 of 77)

Gotout's observation was that the sum itself is in dec, Fezzi, it's just the answers that are in other (declining) bases.

Fezziwig - 29 May 2016 17:59:04 (#17 of 77)

19 can't exist in base 3.

Certainly to do with bases other than 10.

grenadiglia - 29 May 2016 18:13:10 (#18 of 77)

Where does the question come from? Because Toastie's answer of 40 is what I had, based on it being the least unnecessarily complicated one.

Fezziwig - 29 May 2016 18:19:16 (#19 of 77)

Facebook group but I have seen similar before. It says it in the question only 1 in a 1000 people get it. Loads get 96 and and 40 so they can't be right. Those answers will only work with additional mathematical operators. They are not there.

willshome - 29 May 2016 18:21:15 (#20 of 77)

Tommy's right. The notation is simply wrong. you can't just make + and = mean what you choose it to mean. If it was

1 4 5

2 5 12

3 6 21

8 11 ?

That would be one thing. But then you would notice that there's no logic to the 1, 2, 3, 8 unless they are in some way related. So I'd go with the 40, rather than the 96. The 96 doesn't explain why 1, 2, 3, 8.

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