Emmy V.

asked • 07/18/21# For commercials aired during a sporting event, advertisers paid an average of $5 million to air a 30-sec commercial.

For commercials aired during a sporting event, advertisers paid an average of $5 million to air a 30-sec commercial. Even at this rate, some commercials were longer than 30 sec. A total of 60 commercials ran for either 30 sec or 1 min. The total running time was 38 1/2 min. How many of each length commercial aired during the sporting event?

## 1 Expert Answer

Mahmut S. answered • 07/18/21

Fun and Expert Algebra 1 tutor

lets say;

x is # of 30sec commercials

y is # of 1 min commercials (30sec = 0.5 min)

x + y = 60

0.5x +y = 38.5.

one of the way is to cancel y values,

we can multiply second equation by -1 and we have -0.5x -y = -38.5

x + y = 60

-0.5x -y = -38.5

y cancels out and we have

0.5x = 60 - 38.5 = 21.5

if half of x is 21.5 then x = 43

x +y = 60; 43 +y = 60; y = 17

# of 30 sec commercials is 43;

# of 1min commercials is 17;

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Mahmut S.

"The total running time was 3812 min." can you check that part?07/18/21