Posted by **Anonymous** on Monday, May 9, 2011 at 8:32pm.

a disk jockey must play 14 commercial spots during one hour of radio show, each commercial is eiter 30 seconds or 60 seconds long. If the total commercial time during one hour is 11 minutes, then ow many 30 second commercials were played that hour?

- algebra -
**Damon**, Monday, May 9, 2011 at 9:10pm
x of 30 sec so (14-x) are 60 sec

11*60 = 660 sec

so

30 x + 60(14-x) = 660

870 - 30 x = 660

30 x = 210

x = 7

- algebra -
**Reiny**, Monday, May 9, 2011 at 9:14pm
short commercial --- x

long commercial ---- y

x+y = 14 , #1

30x + 60y =11(60)

x + 2y = 22 , #2

#2 - #1

y = 8

then x = 6

6 shorts , 8 long

check : 6+8 = 14

30(6) + 60(8) = 180+480 = 660 = 11(60)

- error 840 not 870 -
**Damon**, Monday, May 9, 2011 at 9:21pm
x of 30 sec so (14-x) are 60 sec

11*60 = 660 sec

so

30 x + 60(14-x) = 660

840 - 30 x = 660

30 x = 180

x = 6

## Answer This Question

## Related Questions

- algebra - A disc jockey must play 14 commercial spots during one hour of radio ...
- math - a disc jockey must play 14 commercial spots during 1 hour of a radio show...
- Math - a disc jockey must play 14 commercial spots during 1 hour of a radio show...
- Math - A disc jockey must play 14commercial spots during 1hour of radio show. ...
- Math-Alebra - A disc Jokey must play 14 commercial spots during 1 hour of a ...
- math - Roscoe must play 9 commercials during his 1-hr radio show. Each ...
- Math - Rudy must play 12 commercials during his 1-hr radio show. Each commercial...
- math - of a radio show. Each commercial is either 30 seconds or 60 seconds long...
- math - if a station broadcasts 8 min. of commercials in 1 hour what is the ratio...
- college math - 3.15 A bank branch located in a commercial district of a city has...

More Related Questions