3/4=3x15/4x15=45/60
4/3=4x20/3x20=80/60
3/5=3x12/5x12=36/60
\(MSC:60\\ \dfrac{3}{4}=\dfrac{3\times15}{4\times15}=\dfrac{45}{60};\dfrac{4}{3}=\dfrac{4\times20}{3\times20}=\dfrac{80}{60};\dfrac{3}{5}=\dfrac{3\times14}{5\times14}=\dfrac{42}{60}\)
3/4=45/60
4/3=80/60
3/5=36/60