Answer:
[tex]\huge\boxed{LCD=20}[/tex]
Step-by-step explanation:
[tex]\dfrac{3}{5}\\\\\text{list of multiples of 5}:0,\ 5,\ 10,\ 15,\ \boxed{\bold{20}},\ 25,\ 30,\ ...\\\\\dfrac{3}{4}\\\\\text{list of multiples of 4}:\ 0,\ 4,\ 8,\ 12,\ 16,\ \boxed{\bold{20}},\ 24,\ 28,\ ...[/tex]
[tex]\dfrac{3}{5}=\dfrac{3\cdot4}{5\cdot4}=\dfrac{12}{20}\\\\\dfrac{3}{4}=\dfrac{3\cdot5}{4\cdot5}=\dfrac{15}{20}[/tex]
