Answer:
16-year-old horse is equivalent to a 48-year-old human. x = 48
Explanation:
We can set up a proportion to solve this problem:
horse age / human age = k
where k is the constant of proportionality. We're told that a 5-year-old horse is equivalent to a 15-year-old human, so we can use this information to find k:
5 / 15 = k
k = 1/3
Now we can use this value of k to find the equivalent human age for a 16-year-old horse:
16 / x = 1/3
Multiplying both sides by x:
16 = x/3
Multiplying both sides by 3:
x = 48
So a 16-year-old horse is equivalent to a 48-year-old human.