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disc jockey must play 12 commercials spots in 1 hour for a radio show,?

how many 30 sec and how many 60 sec commercials did he play if the total commercial time during 1 hr is 8 minutes?

Public Comments

1. The easy way to find this is that 8 minutes would be 16 sets of 30. This means that 4 of them (16-12) can be doubled up to 60. There would be 8 of the 30-second commercials and 4 60-second commercials.