The expected adult weight of a golden retriever puppy is 1.5w, where w is the puppy's weight at 6 months of...

The expected adult weight of a golden retriever puppy is 1.5w, where w is the puppy's weight at 6 months of age. Britney's 6-month-old golden retriever puppy weighs 40 pounds.
What is the expected adult weight of Britney's puppy?
Write your answer as a whole number or decimal.