SOLUTION: there are 3 times as many cars as motorcycles. there are a total of 28 tires. How many motorcycles are there?

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Question 167491: there are 3 times as many cars as motorcycles. there are a total of 28 tires. How many motorcycles are there?
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
lets call # of cars and motorcycles, c and m respectively.
c+m=28 eq 1
c=3m eq 2
take the value from eq 2 and place it in eq 1.
3m+m=28---->4m=28--->highlight%28m=7%29motorcycles
:
highlight%28c=3%287%29=21%29cars