A disc must play 14 commerical spots during 1 hour of a radio show. Each commerical is either 30 seconds or 60 seconds long. If the total commercial time during 1 hour is 11min, how many 30 second commercials were played that hour? How many 60 second commercials?

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let x be no. of commer. of 30 sec and y be of 60
so x*30+y*60=11*60
and x+y=14
solve 2 equations

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