We have that there is 12/5 left, and we need to know how many 3/10 pieces can be made from the leftover.
To know the answer, we need to divide the fraction 12/5 by 3/10 to know this quantity. Then, we have:
[tex]\frac{\frac{12}{5}}{\frac{3}{10}}=\frac{12\cdot10}{5\cdot3}=\frac{120}{15}=8[/tex]We can check this answer if we sum the 3/10 pieces eight times:
[tex]\frac{3}{10}+\frac{3}{10}+\frac{3}{10}+\frac{3}{10}+\frac{3}{10}+\frac{3}{10}+\frac{3}{10}+\frac{3}{10}=\frac{24}{10}=\frac{12}{5}=8\cdot\frac{3}{10}=\frac{24}{10}=\frac{12}{5}[/tex]Therefore, we can make 8 pieces of 3/10 from the leftover pizza (8 pieces.)