r+h = 36
2r+4h = 104
Now just solve as usual.
If there were 36 heads and 104 legs how many horses were their? How many riders were there?
2 answers
From the first equation, we get:
r = 36 - h
Substituting this into the second equation, we get:
2(36 - h) + 4h = 104
Simplifying and solving for h, we get:
72 - 2h + 4h = 104
2h = 32
h = 16
So there were 16 horses. Substituting this back into the first equation, we get:
r + 16 = 36
r = 20
So there were 20 riders.
r = 36 - h
Substituting this into the second equation, we get:
2(36 - h) + 4h = 104
Simplifying and solving for h, we get:
72 - 2h + 4h = 104
2h = 32
h = 16
So there were 16 horses. Substituting this back into the first equation, we get:
r + 16 = 36
r = 20
So there were 20 riders.