At a horse show, there are both people and horse in the ring. maria counted 22 heads and 64 legs. how many horses are in the ring? a

Each individual (horse or person) has only one head so there are 22 individuals.
We know that horse have 4 legs while people only have two.
Let's guess and check
Let's say we do 11 people and 11 horses
11 people have 22 legs and 11 horses have 44 legs - That adds up to 66 legs which is two legs too many.  We can't take a person away -2 because we would have to add a horse +4 which would even bring us further away from 64.  We need to take a horse away -4 and add a person +2 and we will lose two legs
Final  12 people and 10 horses
Check 12 people have 24 legs 10 horses have 40 legs -together they have 64 legs.
Problem solved.

29. because you will divide each number of months by 12 to find the number of years. which would mean, 5, 12.5, 16, 45, 50, 72.5. which is crazy. anyhow, i think you find the median in the middle. and yea hope your test goes good