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
Not sure but:
\(15+3=(3*5)+3\)
Given that \(3+3=4\) thus \(3=1\)
\(5+5=10\) thus \(5=5\)
Now substitute
\(1*5+1=6\)
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
+210 
