1) 4/15-1/12=4*4/60-5/60=16/60-5/60=11/60
2)4/15+11/60=16/60+11/60=27/60
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1) 4/15-1/12=4*4/60-5/60=16/60-5/60=11/60
2)4/15+11/60=16/60+11/60=27/60