I would use a proportion:
336 miles/7 hours = x miles/15 hours (cross multiply)
x= 720 miles
$2 :) !!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
50
Step-by-step explanation:
The ratio of marked fish to caught fish is 4:10, we need to solve for x in 20:x, since 4 * 5 = 20, 10 * 5 = x so x = 50 fish.