"Rocky is 44 years old," said Jenna to her friend.
"She is? But your brother said your dog was younger than that. And I just asked him a
few minutes ago. Weird."
"Hey!" said Alex snooping by the door. "That's because Jenna doesn't use the simple
formula to multiply a dog's age by 7."
"I may not use simple, but I use what's more accurate. A dog's first year of life is about 15
human years. A dog's second year equals about 9 human years. Every year after that is
about 5 human years. That's why Rocky is 44 years old."
What's Rocky's real age?
How old would Alex say Rocky is?
Because only the first year and second year of a dog's life are calculated differently, you can add 15 and 9, subtract that from 44, and then divide the result by 5 to find Rocky's real age.
4+2 (15 and 9)=6
So Rocky's actual age is 6.
Alex just multiplies a dog's age by 7, so Alex would say that Rocky is 6 * 7 =42 years old.
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