we have
31 1/4 ft of tape
Convert to an improper fraction
31 1/4=31+1/4=125/4 ft
each box requires 12 1/2 ft-----> 25/2 ft
31 1/4 : 12 1/2=(125/4):(25/2)=(125/4)x(2/25)=250/100=2.5=2 1/2
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