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avatar+210 

2+2=3

3+3=4

4+4=5

BUT....

5+5=10

10+10=20

SO...

what is 15+3?

 

P.S    I don't know myself

off-topic
 May 1, 2020
 #1
avatar
0

Not sure but:

15+3=(35)+3

Given that 3+3=4 thus 3=1

5+5=10 thus 5=5

Now substitute 

15+1=6

 May 1, 2020
 #2
avatar+210 
0

No... If 5 and 10 stay the same ... So does 15, and any other number that is not divisible by 5 becomes 1 so the answer is 16

TacoBell  May 2, 2020

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