Answer:
Step-by-step explanation:
The box  when shipped is 5 pounds
The box alone =         2 pounds     Subtract
What's left is            3 pounds
1 sea turtle weighs       1 pound
3 sea turtles weigh       x
1/3 = 1 / x               Cross multiply
1*x = 3*1
x = 3
He ships 3 sea turtles.