Its 3 because there's a girl then a guy so 1 of each they have a kid how many people are there 3 so 3
1+1=3
2
1+1=2
a very easy and obvious equasion, with the answer of 3.
bob: hey whats 1+1?joe: thats obvious, its 3.
Someone:What's 1+1? Me:2
11
1+1=11