Answer. 25 days
Explanation. If the dog eats 2/5 of a tin a day and there are 10 tins, how long will it take for the dog to eat 10 tins. Well, we know that day the dog eats 2/5 of a tin, then each tin will last 2 1/2 days. Now all we have to do is multiply 2 1/2 by 10. The answer is 25. Hope this helps, let me know if it’s correct so others can use it :)
Good luck.