###Human: Stefan, Vail, and Aiguo collected seashells. Stefan had 16 more seashells than Vail. Vail had 5 less than Aiguo. Aiguo had 20 seashells. How many seashells did the 3 children have in total?, ### Assistant: Aiguo = 20 shells
Vail = 20 - 5 = 15 shells
Stefan = 15 + 16 = 31 shells
Total = 20 + 15 + 31 = 66
The 3 children had 66 seashells altogether. 
 So the answer is :  66