# Maths problem has internet stumped

How about taking a look at this brainteaser?

This problem has gone viral in recent days after being shared on Facebook by one Randall Jones .

The problem in full,
1 + 4 = 5
2 + 5 = 12
3 + 6 = 21
8 + 11 = ?

So – what’s the answer to 8 + 11?

Randall’s post has more than 1.1 million comments so far, and the vast majority of people are suggesting either 40 or 96 as the answer.

So which of those is right – and why?

The solution

Well – either 40 or 96 could be the right answer, depending on how you look at it.

• For the answer to be 40: add the solution to the previous line to the numbers on the next line:

1 + 4 = 5

5 + 2 + 5 = 12

12 + 3 + 6 = 21

21 + 8 + 11 = 40

• For the answer to be 96: multiply the first number by the second number, then add the outcome to the first number:

1 + (1 x 4) = 5

2 + (2 x 5) = 12

3 + (3 x 6) = 21

8 + (8 x 11) = 96

### 35 Responses

1. Dtur says:

this is silly the problem is not written with brackets so it can only be 40

2. Dtur says:

I don’t understand how it can be 96 there is no multiplication indicated within this calculation 96 would be overthinking it!!!!!

3. Mischa Mardanus Budiono says:

My answer would either be 40 because if you looked at it

1 + 4 = 5 LOOK AND COUNT ALL NUMBERS TO ADD UP 5+2+5+3+6+8+11=40

2 + 5 = 12

3 + 6 = 21

8 + 11 = 40

4. Bob says:

It has to be 40

5. the anser is 96!!1

6. ryan says:

it is 40

7. wha? says:

wha? its 19! 11+8=19 1+8=9+10=19! simple! adding the numbers would be 5+12+21+19= 58! and 5+12+21= 49

8. kauni says:

its 19

9. L and B says:

If it is 96 there has to be brackets so it can’t be 96
So it is 40 because on all the problems the answer is always the number that was the awnser to the problem be for plus the to numbers you are ment to plush to gether and 21 + 8 + 11 =40
?

10. lamblover says:

40!!!

11. Michael says:

its 40 easy

12. timmy says:

its 69

13. Taine says:

Its got to be 40

14. Mary says:

40

15. Josh says:

it has to be 90

16. Hamy says:

40 or 96

19
Because if it were 40 then there would not be an equals sign and if it were 96 then the equation would specify that

18. llamashelby says:

its 30

19. Anthony says:

it would have to be 96

20. i think its 40 😛 i don’t really know properly 😛 😛 😛 😛 😛

21. bob says:

40 has to be

22. Sylvia says:

1 + 4 = 5
5 + 2 = 7
7 + 5 = 12
3 + 6 = 9
9 + 12 = 21
8 + 11 = 19
19 + 21 = 40
It is so simple I don’t get why people don’t get it
BTW I am 10

23. TOM says:

I got it immediately

24. G says:

I don’t get it!!!!!!!! What is it BTW I am 11

25. smartypants says:

I get how it can be 40 but 96 is nonsense! But at first i didn’t know there was a pattern so I thought it was 19 because 8+11=19.

26. smartypants says:

I don’t think you should be ashamed if you didn’t get it because I asked my teacher and she actually didn’t understand it!

27. CheekyMonkey187 says:

I thought it was 30 because:

1+4 equals 5
2+5 equals 12 because 1 plus 2 equals 3 and 3 plus 2 equals 5
3+6 equals 21 because 2 plus 1 equals 3 and 3 plus 3 equals 6
8+11 equals 30 because 3 plus 0 equals 3 and 3 plus 8 equals 11.

That is my theory and it works!!!!

28. bandit500 says:

easy

29. Do people actually read the explanation these days!?!?!?!?!??!??!!????!?!!!

30. Jimmy says:

### Featured Content

1
##### Should school holidays be changed?
Hands down, we all love school holidays, that’s a given....
2

### ODD STUFF NEWS

1
##### Air guitar kangaroo wins photo competition
The Comedy Wildlife Photography Awards are back, and this year...
1
##### World Record for Most Teeth
Twenty-six-year-old Kalpana Balan from India, has clinched a coveted spot...
1
##### World’s largest drone show
At the International Association of Amusement Parks and Attractions expo...
1
##### 100-Old Library Book Returns Home in St Paul
In a delightful twist of literary history, a library book,...

### World & National News

1
##### Disney’s 2023 lacks a Billion-Dollar Movie
In a departure from recent trends, Walt Disney Studios is...
1
##### Should school holidays be changed?
Hands down, we all love school holidays, that’s a given....
1
##### Wānaka Says No to McDonald’s!
Imagine living in a super pretty town and finding out...
1
##### Wellington Phoenix Keep Winning
The Wellington Phoenix are having a fantastic time in the...