According to Pepin Heights, an apple orchard in Minnesota, a peck is equal to 10 to 12 pounds, or about 32 medium apples. A bushel is equal to 42 to 48 pounds, or about 126 medium apples.
These measurements are approximate because the number of apples that fit into a peck-sized container, or a bushel-sized one, varies depending on the size of the apples (or other produce being measured). Pecks and bushels are both dry measures, while the pound is a measure of weight.
A peck typically makes three or four 9-inch pies, while a bushel makes 15 of those same pies. Pick Your Own converts a bushel of apples into 10 to 12 quarts of juice, or 12 to 15 quarts of applesauce (no sugar added). A peck makes 2 to 3 quarts of juice, or 2 to 4 quarts of applesauce.