three fifths is .6 decimal because if you multiply $${\frac{{\mathtt{3}}}{{\mathtt{5}}}}$$ *20 you get $${\frac{\left({\mathtt{3}}{\mathtt{\,\times\,}}{\mathtt{20}}\right)}{\left({\mathtt{5}}{\mathtt{\,\times\,}}{\mathtt{20}}\right)}} = {\frac{{\mathtt{60}}}{{\mathtt{100}}}}$$ and the reduce that to a decimal of .6