Answer:
28 sandwiches
Step-by-step explanation:
If Jack takes 7 minutes to make a pie, the time that would take Jack to produce 4 pies is:
[tex]t=4*7=28\ minutes[/tex]
Jack would be willing to trade away the amount of sandwiches he is able to produce in 28 minutes to get 4 pies from Rodger. In 28 minutes, the number of sandwiches Jack can produce is:
[tex]S=1*28=28\ sandwiches[/tex]
Jack would be willing to trade away 28 sandwiches for 4 pies.