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subtraction with renaming
Three Commercials are played in a row between songs on the radio. The three commercials fill exactly 3 minutes of time. If the first commercial used 1 1/6 minutes, and the second use 3/5 minutes, how long is the third commercial?
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** **** 1/6 * 7/6 **
= *** Given t1+t2+t3
* 3 ** ******* +t3
* * So ** * *
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37/30 * ****** ****