A chef had 7 potatoes how many bowls of mashed potatoes could he make if each bowl used one-fifth of a potato

35 bowls of mashed potatoes.

Step-by-step explanation:

To make a bowl of mashed potatoes, the chef uses one-fifth of a potato.

To use up one potato, he will make 5 bowls of mashed potatoes from it:

1 / (1/5) = 5 bowls of mashed potatoes.

With the 7 potatoes he has, he can make 7 x 5 bowls = 35 bowls of mashed potatoes.