Question 1178769: In the year 2021, Dylan is four years older than his sister Anna, Anna is four times as old as their dog Zona, and the ages of Anna and Zona sum to one less than Dylan’s age. If all three celebrate their birthdays today, compute the year that Zona was born.
Answer by mananth(16946)   (Show Source):
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In the year 2021, Dylan is four years older than his sister Anna,
d=a+4
Anna is four times as old as their dog Zona,
a=4z
and the ages of Anna and Zona sum to one less than Dylan’s age.
a+z=d-1
z=3
Zona was born in 2018
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