[ ] + [ ] + [ ] = 30

Fill the boxes using

(1, 3, 5, 7, 9, 11, 13, 15)

You can also repeat the nos.

Tough. No even number?

Mehn!

[15]+[5]+[11]=31

Throw the 1 away it rounds up to 30
Simple

Olucheye:
use another operand within the boxes,

It's as simple as,

[15] + [11] + [{9-5}] = 30

PS: The answer lies within your knowledge of how brackets work.

Olojoro

You should first forget about repeating numbers, you will never get an answer that way.
There is no answer. You can never get an even number by adding three odd/ prime numbers. If you come up with an answer, i will hit my head against a wall.

(9)+(13)+(9)=30
or
(15)+(15) + I don't need the other bracket abi you think say I come look Uche face = 30

frankezi:
(9)+(13)+(9)=30
or
(15)+(15) + I don't need the other bracket abi you think say I come look Uche face = 30

9+9 = 18: 18+13 = 31

KillerBeauty:
[15]+[5]+[11]=31

Throw the 1 away it rounds up to 30
Simple

Throw it to where?

It's simple base addition let's use base ₉:
So 9₉+9₉+9₉=30
Those who have done computer science or electrical engineering will get it, for those who don't, we operate using base₁₀, so for base₉ let's all calculations such as 4+4=8 are the same as base₁₀, but when it comes to calculations like
9+9= 20, it's just like base₂ where
1₂+1₂=10.

You see in base₉ the number 9 is the last number, so there's no 10, so when you add the last numbers together you get 20 for arithmetic convenience, how? well in base₉ there are 10 numbers: 0,1,2,3,4,5,6,7,8,9 so it'd expected that if you add the tenth number to itself it should give the twentieth number then if you add again it should give the thirtieth number.

pkjag:
It's simple base addition let's use base ₉:
So 9₉+9₉+9₉=30
Those who have done computer science or electrical engineering will get it, for those who don't, we operate using base₁₀, so for base₉ let's all calculations such as 4+4=8 are the same as base₁₀, but when it comes to calculations like
9+9= 20, it's just like base₂ where
1₂+1₂=10.

You see in base₉ the number 9 is the last number, so there's no 10, so when you add the last numbers together you get 20 for arithmetic convenience, how? well in base₉ there are 10 numbers: 0,1,2,3,4,5,6,7,8,9 so it'd expected that if you add the tenth number to itself it should give the twentieth number then if you add again it should give the thirtieth number.

I don't understand at all...!!!!!!!!!!

pkjag:
It's simple base addition let's use base ₉:
So 9₉+9₉+9₉=30
Those who have done computer science or electrical engineering will get it, for those who don't, we operate using base₁₀, so for base₉ let's all calculations such as 4+4=8 are the same as base₁₀, but when it comes to calculations like
9+9= 20, it's just like base₂ where
1₂+1₂=10.

You see in base₉ the number 9 is the last number, so there's no 10, so when you add the last numbers together you get 20 for arithmetic convenience, how? well in base₉ there are 10 numbers: 0,1,2,3,4,5,6,7,8,9 so it'd expected that if you add the tenth number to itself it should give the twentieth number then if you add again it should give the thirtieth number.

Nobody's got time for all these... Base or no base, top or no top.

emmyrichie:

Nobody's got time for all these... Base or no base, top or no top.

The addition is definitely base addition, i may have made a mistake but i'm lookng at it to correct it

pkjag:
The addition is definitely base addition, i may have made a mistake but i'm lookng at it to correct it

I'm waiting...

emmyrichie:

I'm waiting...

Sorry forgot my base arithmetic, infact the moderator should delete my post.

pkjag:
Sorry forgot my base arithmetic, infact the moderator should delete my post.

emmyrichie:

Where did you get that intractable puzzle, or are you just messing with us?

pkjag:
Where did you get that intractable puzzle, or are you just messing with us?

It's an aptitude test question from Apple and Microsoft.

Here's my attempt.
N/B: The question didn't specify the units of the number(s) on the two sides of the equation, thus I'm free to assume mine.

So,

1 + 1 + 5 = 30

How;
1 (day) + 1 (hour) + 5 (hours) = 30 (hours).

That's the way I choose to reason this, and I'm entitled to my opinion.

Thanks.

SegunMike:
Here's my attempt.
N/B: The question didn't specify the units of the number(s) on the two sides of the equation, thus I'm free to assume mine.

So,

1 + 1 + 5 = 30

How;
1 (day) + 1 (hour) + 5 (hours) = 30 (hours).

That's the way I choose to reason this, and I'm entitled to my opinion.

Thanks.

This is good...thinking out of the box

SegunMike:
Here's my attempt.
N/B: The question didn't specify the units of the number(s) on the two sides of the equation, thus I'm free to assume mine.

So,

1 + 1 + 5 = 30

How;
1 (day) + 1 (hour) + 5 (hours) = 30 (hours).

That's the way I choose to reason this, and I'm entitled to my opinion.

Thanks.

If there was/were units, it would have been indicated there...
What if they were just numbers?

KillerBeauty:
[15]+[5]+[11]=31

Throw the 1 away it rounds up to 30
Simple

Throwing away "a whole number"? That's going overboard ...plz tell everyone its a joke...

1year+11months+7months = 30months

Godschild2:
1year+11months+7months = 30months

Lol... are you a fan of Dan Brown?

Olucheye:
use another operand within the boxes,

It's as simple as,

[15] + [11] + [{9-5}] = 30

PS: The answer lies within your knowledge of how brackets work.

Reasonable attempt!

emmyrichie:


Lol... are you a fan of Dan Brown?

Nope, though i've read some before...Lol

pkjag:
It's simple base addition let's use base ₉:
So 9₉+9₉+9₉=30
Those who have done computer science or electrical engineering will get it, for those who don't, we operate using base₁₀, so for base₉ let's all calculations such as 4+4=8 are the same as base₁₀, but when it comes to calculations like
9+9= 20, it's just like base₂ where
1₂+1₂=10.

You see in base₉ the number 9 is the last number, so there's no 10, so when you add the last numbers together you get 20 for arithmetic convenience, how? well in base₉ there are 10 numbers: 0,1,2,3,4,5,6,7,8,9 so it'd expected that if you add the tenth number to itself it should give the twentieth number then if you add again it should give the thirtieth number.

I ain't gat no time ⌚ for dz sh¡t

(5+5)+(5+5)+(5+5)=30

pkjag:
It's simple base addition let's use base ₉:
So 9₉+9₉+9₉=30
Those who have done computer science or electrical engineering will get it, for those who don't, we operate using base₁₀, so for base₉ let's all calculations such as 4+4=8 are the same as base₁₀, but when it comes to calculations like
9+9= 20, it's just like base₂ where
1₂+1₂=10.

You see in base₉ the number 9 is the last number, so there's no 10, so when you add the last numbers together you get 20 for arithmetic convenience, how? well in base₉ there are 10 numbers: 0,1,2,3,4,5,6,7,8,9 so it'd expected that if you add the tenth number to itself it should give the twentieth number then if you add again it should give the thirtieth number.

U be correct olodo!

@emmyrichie, provide a link or quote your source to stand better chances of hitting frontpage.