SOLUTION: i need an example of a distance, a chemistry, and a "heads and legs" word problem and the answers. my teacher was talking about them and i didnt know what they were

Question 408217: i need an example of a distance, a chemistry, and a "heads and legs" word problem and the answers. my teacher was talking about them and i didnt know what they were
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
A heads and legs problem:
A farmer has chickens and cows. He counts 40 heads and 86 legs
How many chickens and cows does he have?
Let = number of chickens
Let = number of cows
-------------------------
given:
(1) (all have just 1 head)
(2)
----------------
This is 2 equations and 2 unknowns, so it's solvable
from (2):

By substitution:

and

There are 3 cows and 37 chickens
Check answer:
(2)

OK
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