Which equation represents the unit fraction shown in the diagram? A grid model with 100 squares. 20 squares are shaded. StartFraction 20 Over 100 EndFraction = one-fifth StartFraction 20 Over 100 EndFraction = two-fifths StartFraction 20 Over 100 EndFraction = one-half StartFraction 20 Over 100 EndFraction = StartFraction 1 Over 10 EndFraction