SOLUTION: A train carries 92 passengers altogether. Some cars carry 6 passengers and some cars carry 4 passengers. There are three less 6 passenger cars than 4 passengers cars. How many 4 pa

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Question 391332: A train carries 92 passengers altogether. Some cars carry 6 passengers and some cars carry 4 passengers. There are three less 6 passenger cars than 4 passengers cars. How many 4 passenger cars are there?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A train carries 92 passengers altogether. Some cars carry 6 passengers and some cars carry 4 passengers. There are three less 6 passenger cars than 4 passengers cars. How many 4 passenger cars are there?
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Equations:
6s + 4f = 92 passengers
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s = f-3
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Substitute for "s" and solve for "f":
6(f-3) + 4f = 92
6f-18 + 4f = 92
10f = 110
f = 11 (# of four-passenger cars)
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Cheers,
Stan H.
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