Step-by-step explanation :
Sam : 0.25 = [tex]\frac{25}{100}[/tex] = [tex]\frac{1}{4}[/tex] (Answer)
Mark : 0.30 = [tex]\frac{30}{100}[/tex] = [tex]\frac{3}{10}[/tex] (Answer)
Jill : 0.35 = [tex]\frac{35}{100}[/tex] = [tex]\frac{7}{20}[/tex] (Answer)
Total amount of pizza eaten = 0.25 + 0.30 + 0.35 = 0.9
Amount of pizza left = 1.0 - 0.9 = 0.1 = [tex]\frac{10}{100}[/tex] = [tex]\frac{1}{10}[/tex] (Answer)