Posted by Anonymous on Monday, September 20, 2010 at 10:17pm.
a disc jockey must play 14 commercial spots during 1 hour of a radio show.Each commercial is either 30 seconds or 60 seconds long. If the total commercial time during 1 hour is 11 min, how many 30second commercials were played that hour. How many 60second commercials.

Math  Henry, Wednesday, September 22, 2010 at 12:54am
11 min * 60 s/min = 660 s,
x  30 s comm,
y  60 s comm,
x + y = 14 comm,
y = 14  x,
30x + 60y = 660 s,
Substitute 14  x for y:
30x + 60(14  x) = 660,
30x + 840  60x = 660,
60x = 660  840
30x = 180,
x = 6 30 s comm,
6 + y = 14,
y = 8 60 s comm.
Answer This Question
Related Questions
 math  a disc jockey must play 14 commercial spots during 1 hour of a radio show...
 algebra  A disc jockey must play 14 commercial spots during one hour of radio ...
 Math  A disc jockey must play 14commercial spots during 1hour of radio show. ...
 algebra  a disk jockey must play 14 commercial spots during one hour of radio ...
 MathAlebra  A disc Jokey must play 14 commercial spots during 1 hour of a ...
 math  Roscoe must play 9 commercials during his 1hr radio show. Each ...
 math  of a radio show. Each commercial is either 30 seconds or 60 seconds long...
 Math  Rudy must play 12 commercials during his 1hr radio show. Each commercial...
 math  if a station broadcasts 8 min. of commercials in 1 hour what is the ratio...
 math  between 8pm and 9pm the station broadcasts 8 min of commercials. What is ...
More Related Questions