SOLUTION: last month tim trained 3 times as many dogs as cats. If the total number of cats and dogs he trained last month was 28. How many cats did Tim train?

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Question 902239: last month tim trained 3 times as many dogs as cats. If the total number of cats and dogs he trained last month was 28. How many cats did Tim train?
Answer by Stitch(470) About Me  (Show Source):
You can put this solution on YOUR website!
Let D = Number of Dogs
Let C = Number of Cats
-----------------
Equation 1: D+=+3C
Equation 2: D+%2B+C+=+28
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Plug 3C into equation 2 for D
Equation 2: D+%2B+C+=+28
%283C%29+%2B+C+=+28
Combine like terms.
4C+=+28
Divide both sides by 4
highlight%28C+=+7%29
Now plug 7 into equation 1 for C
Equation 1: D+=+3C
D+=+3%2A%287%29
highlight_green%28D+=+21%29