Answer:
7/4 lb of pork = 1 3/4 lb of pork
Explanation:
The fraction of that 7 lb of meat that is beef is (3/4), which stems from adding 3 and 1 and using it as the denominator of the fractions representing beef and pork.
(3/4)(7 lb) = 21/4 lb of beef plus p lb of pork sum up to 7 lb; then
7 lb - 21/4 lb = p lb of pork, or 28/4 lb - 21/4 lb = 7/4 lb of pork.
3 3p
--- = ------------
1 p