Answer:
The total amount run by Sarah, Frank, and Suzy = 13/2 miles
Explanations:
The number of miles that Sarah ran = 2/3 miles
Frank ran double of what Sarah ran
The number of miles that Frank ran = 2 x 2/3 = 4/3 miles
Suzy ran triple of what Frank ran plus another half a mile
The number of miles that Suzy ran = (3 x 4/3) + (1/2)
The number of miles that Suzy ran = 4 + 1/2 = 9/2
The total amount run by Sarah, Frank, and Suzy = 2/3 + 4/3 + 9/2 = 6/3 + 9/2
The total amount run by Sarah, Frank, and Suzy = 2 + 9/2 = 13/2 miles