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Answer:
No. They are not in proportion
Step-by-step explanation:
[tex]\sf \dfrac{4}{5} \ \text{is in the simplest form}[/tex]
[tex]\sf \text{Simplest form of $\dfrac{12}{20}$} = \dfrac{12 \div 4}{20 \div 4}=\dfrac{3}{5}[/tex]
So, they are not in proportion