SOLUTION: Rudy must play 12 commercials his 1-hr radio show Each commercial is either 30 sec or 60 sec long. If the total commercial time during that 1-hr is 10 min how many commercials of e
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Question 135269: Rudy must play 12 commercials his 1-hr radio show Each commercial is either 30 sec or 60 sec long. If the total commercial time during that 1-hr is 10 min how many commercials of each type does Rudy play? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! Rudy must play 12 commercials his 1-hr radio show Each commercial is either 30 sec or 60 sec long. If the total commercial time during that 1-hr is 10 min how many commercials of each type does Rudy play?
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Let # of 30 sec commercials be x; time involved is 30x seconds
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# of 60 sec commercials is "12-x" ; time involved is 60(12-x) = 720-60x
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EQUATION:
time + time = 10 min or 600 sec
30x + 720-60x = 600
-30x = -120
x = 4 (# of 30 sec commercials)
12-x = 8 (# of 60 sec commercials)
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Cheers,
Stan H.
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