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?
Aiguo = 
<gadget id="calculator">20</gadget>
<output>20</output>
20 shells.
Vail = 20 - 5 = 
<gadget id="calculator">20-5</gadget>
<output>15</output>
15 shells.
Stefan = 15 + 16 = 
<gadget id="calculator">15+16</gadget>
<output>31</output>
31 shells.
Total = 20 + 15 + 31 = 
<gadget id="calculator">20+15+31</gadget>
<output>66</output>
66.
The 3 children had 66 seashells altogether.

<result>66</result>