Since each bowel use one-seventh of a potato;
and the chef had 7 potatoes;
Then, he could make;
[tex]\begin{gathered} 1bowel\rightarrow\frac{1}{7}potato \\ \text{xbowel}\rightarrow7potatoes \\ x=\frac{7}{\frac{1}{7}} \\ x=7\times7 \\ x=49\text{bowels} \end{gathered}[/tex]Thus, the chef could make 49 bowels of mashed potatoes with his 7 potatoes.
