Donkey’s Years

Susan has two horses, two dogs and a mouse.They have a combined age of 52 human years.

• The horses have a combined age of 33 human years, one is twice as old as another.

• The dogs have a combined age of 16 human years. They are both the same age.

Animal 1 human year = Typical maximum life span

(human years)

Horse 2.2 horse years 40 years

Dog 7 dog years 12-17 years

Mouse 34 mouse years 4 years

1) How old is the mouse?

2) How old are each of her pets in animal years?

3) Susan turned 80 in 2006 and had her first pet in 1938, how many horses, dogs and mice could she have owned?