SOLUTION: a disc jockey must play 12 commercial spots during a 1 hour of radio.each commercial spot is either 30 seconds or 60 seconds. if the total commercial time is 1 hour 8 minutes, how
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Question 260497: a disc jockey must play 12 commercial spots during a 1 hour of radio.each commercial spot is either 30 seconds or 60 seconds. if the total commercial time is 1 hour 8 minutes, how many 30 second commercials are there?
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
Let X = 30 sec and Y = 60 sec spots. Now 1 hr 8 min - 1 hr = 8 min = 480 seconds.
we get
(i)
(ii)
step 1 - solve (i) for X to get
(iii)
substitute (iii) into (ii) to get
(iv)
distribute to get
(v)
combine like terms to get
(vi)
Y = 4
X = 8
There are 8 - 30 second comercials
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