Respuesta :

1/5, 0.4, 1/2, 0.75

Just convert all of them to decimals first then it should be easy or you . 
first you should put them all in the same form so you should change 1/2 to 0.5 and 1/5 to 0.2 then you order them. 1/5, 0.4, 1/2, 0.75