Context: In 2013, a study found that mixed breeds live on average 1.2 years longer than pure breeds, and that increasing body-weight was negatively correlated with longevity (i.e. the heavier the dog the shorter its lifespan).

Question: Mutts, dogs that have several breed characteristics, live how much longer than purebred dogs?
Answer: 1.2 years

Question: Do bigger dogs typically have longer or shorter lives?
Answer: shorter

Question: When was a study done that discovered mixed breeds tend to live longer than pure breeds?
Answer: 2013

Question: Typically, how much longer do mixed breeds live?
Answer: 1.2 years longer